Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans (Details)

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Pension and Other Postretirement Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Benefit plan contributions [Abstract]        
Pension Plan $ 0   $ 0  
Additional benefit plan contribution for the remainder of fiscal 2012 0   0  
Pension [Member]
        
Net periodic benefit cost [Abstract]        
Service cost 1,424 1,237 2,848 2,474
Interest cost 1,950 1,867 3,900 3,734
Expected return on plan assets (1,953) (1,843) (3,906) (3,686)
Amortization:        
Amortization of prior service cost (11) 6 (22) 12
Amortization of net actuarial loss 1,680 1,338 3,360 2,676
Net benefit cost 3,090 2,605 6,180 5,210
Other Postretirement [Member]
        
Net periodic benefit cost [Abstract]        
Service cost 182 158 364 316
Interest cost 321 313 642 626
Expected return on plan assets 0 0 0 0
Amortization:        
Amortization of prior service cost (113) (119) (226) (238)
Amortization of net actuarial loss 134 102 268 204
Net benefit cost 524 454 1,048 908
Benefit plan contributions [Abstract]        
Supplemental Retirement Plan     0  
Other Postretirement Plan     497  
Pension Plan 632   632  
Additional benefit plan contribution for the remainder of fiscal 2012 632   632  
Supplemental Retirement [Member]
        
Benefit plan contributions [Abstract]        
Supplemental Retirement Plan     366  
Other Postretirement Plan     0  
Pension Plan 400   400  
Additional benefit plan contribution for the remainder of fiscal 2012 $ 400   $ 400