Share-Based Payments (Details) - USD ($)
$ / shares in Units, $ in Thousands |
3 Months Ended |
9 Months Ended |
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
| Share-based compensation, aggregate disclosures [Abstract] |
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| Total stock-based compensation cost |
$ 2,274
|
$ 1,667
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$ 6,838
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$ 4,906
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| Future income tax benefit from compensation expense recognized |
887
|
650
|
2,667
|
1,913
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| Cash received from stock options exercised |
129
|
217
|
3,907
|
2,045
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| Tax benefit realized from options exercised |
$ 16
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$ 1
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$ 337
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$ 186
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| 2012 Equity Incentive Plan [Member] |
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| Share-based compensation, aggregate disclosures [Abstract] |
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| Term of plan |
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10 years
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| Maximum number of shares available for grants or awards (in shares) |
2,500,000
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| Shares reserved for future issuance under award plan (in shares) |
1,476,798
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| Restricted Stock [Member] |
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| Share-based compensation, aggregate disclosures [Abstract] |
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| Vesting rights |
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With respect to outstanding restricted share grants, for grants made prior to fiscal 2013, generally one-half of the shares vest on the third anniversary of the grant date, with the remaining one-half of the shares vesting in one-third increments upon attainment of pre-defined levels of appreciation in the market value of the Company’s Class A Common Stock.
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| Award expiration |
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Unvested restricted shares generally expire on the earlier of five years from the date of grant, upon employment termination, or within specified time limits following voluntary employment termination (with the consent of the Company), retirement or death. The Company issues restricted shares from treasury shares.
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| Restricted stock activity [Roll Forward] |
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| Non-vested at beginning of period (in shares) |
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|
575,150
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| Granted (in shares) |
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215,370
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| Vested (in shares) |
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(158,992)
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| Expired or forfeited (in shares) |
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(36,294)
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| Non-vested at end of period (in shares) |
595,234
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|
595,234
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| Non-vested weighted-average grant-date fair value, beginning of period (in dollars per share) |
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|
$ 33.83
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| Granted, weighted-average grant-date fair value (in dollars per share) |
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|
40.07
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| Vested, weighted-average grant-date fair value (in dollars per share) |
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|
34.42
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| Expired or forfeited, weighted-average grant-date fair value (in dollars per share) |
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|
28.53
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| Non-vested weighted-average grant-date fair value, end of period (in dollars per share) |
$ 36.26
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$ 36.26
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| Unrecognized compensation cost [Abstract] |
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| Unrecognized compensation cost on non-vested awards |
$ 9,774
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| Weighted average period of recognition of unrecognized compensation cost on non-vested awards |
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1 year 8 months 12 days
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| Fair value assumptions [Abstract] |
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| Expected volatility (in hundredths) |
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22.20%
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26.60%
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| Dividend yield (in hundredths) |
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1.00%
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1.10%
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| Average risk-free interest rate (in hundredths) |
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1.70%
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1.40%
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| Average expected term |
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1 year 9 months 18 days
|
2 years
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| Stock Options [Member] |
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| Share-based compensation, aggregate disclosures [Abstract] |
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| Exercisable rights |
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Outstanding stock options are generally exercisable in one-third increments upon the attainment of pre-defined levels of appreciation in the market value of the Company’s Class A Common Stock.
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| Vesting rights |
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Options generally vest in one-third increments after three, four and five years, respectively, from the grant date (but, in any event, not until the attainment of the market value thresholds)
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| Award expiration |
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The options expire on the earlier of ten years from the date of grant, upon employment termination, or within specified time limits following voluntary employment termination (with the consent of the Company), retirement or death. The Company generally settles employee stock option exercises with treasury shares., upon employment termination, or within specified time limits following voluntary employment termination (with the consent of the Company), retirement or death. The Company generally settles employee stock option exercises with treasury shares.
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| Stock option activity [Roll Forward] |
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| Outstanding, beginning of period (in shares) |
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512,322
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| Exercised (in shares) |
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(102,544)
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| Expired or forfeited (in shares) |
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(69,173)
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| Outstanding, end of period (in shares) |
340,605
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|
340,605
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| Exercisable (in shares) |
97,000
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97,000
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| Outstanding, weighted-average exercise price, beginning of period (in dollars per share) |
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$ 38.62
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| Exercised, weighted-average exercise price (in dollars per share) |
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38.10
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| Expired or forfeited, weighted-average exercise price (in dollars per share) |
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|
36.53
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| Outstanding, weighted-average exercise price, end of period (in dollars per share) |
$ 39.20
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$ 39.20
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| Exercisable, weighted-average exercise price (in dollars per share) |
$ 38.78
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| Outstanding, weighted-average remaining contractual term |
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|
1 year
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| Outstanding, aggregate intrinsic value |
$ 4,747
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| Exercisable, weighted-average remaining contractual term |
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9 months 18 days
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| Exercisable, aggregate intrinsic value |
$ 1,392
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| Intrinsic value of options exercised |
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$ 897
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$ 510
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| Non-vested options activity [Roll Forward] |
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| Non-vested at beginning of period (in shares) |
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312,442
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| Expired or forfeited (in shares) |
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(68,837)
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| Non-vested at end of period (in shares) |
243,605
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|
243,605
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| Non-vested, weighted-average grant-date fair value, beginning of period (in dollars per share) |
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$ 11.21
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| Expired or forfeited, weighted-average grant-date fair value (in dollars per share) |
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|
11.70
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| Non-vested, weighted-average grant-date fair value, end of period (in dollars per share) |
$ 11.07
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$ 11.07
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| Director Fee Plan, aggregate disclosures [Abstract] |
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| Option awards outstanding (in shares) |
340,605
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|
512,322
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| Director Fee Plan [Member] |
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| Share-based compensation, aggregate disclosures [Abstract] |
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| Shares reserved for future issuance under award plan (in shares) |
150,000
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| Stock option activity [Roll Forward] |
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| Outstanding, end of period (in shares) |
0
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0
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| Director Fee Plan, aggregate disclosures [Abstract] |
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| Annual retainer fee paid to non-employee directors |
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$ 75
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| Annual retainer fee paid to non-employee Chairman of the Board |
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|
175
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| Shares deferred under the Director Fee Plan (in shares) |
17,005
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| Value of annual stock based grant |
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$ 110
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| Total stock options granted to date (in shares) |
22,300
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| Option awards outstanding (in shares) |
0
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0
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| Total restricted stock awards granted to date (in shares) |
136,568
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| Restricted stock awards unvested (in shares) |
33,418
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