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
Dec. 31, 2011
Dec. 31, 2010
Pension [Member]
    
Net periodic benefit cost [Abstract]    
Service cost $ 1,424 $ 1,237
Interest cost 1,950 1,867
Expected return on plan assets (1,953) (1,843)
Amortization of prior service cost (11) 6
Amortization of net actuarial loss 1,680 1,338
Net benefit cost 3,090 2,605
Other Postretirement [Member]
    
Net periodic benefit cost [Abstract]    
Service cost 182 158
Interest cost 321 313
Expected return on plan assets 0 0
Amortization of prior service cost (113) (119)
Amortization of net actuarial loss 134 102
Net benefit cost 524 454
Benefit plan contributions [Abstract]    
Supplemental Retirement Plan 0  
Other Postretirement Plan 261  
Pension Plan 868  
Additional benefit plan contribution for the remainder of fiscal 2012 868  
Supplemental Retirement [Member]
    
Benefit plan contributions [Abstract]    
Supplemental Retirement Plan 185  
Other Postretirement Plan 0  
Pension Plan 581  
Additional benefit plan contribution for the remainder of fiscal 2012 $ 581