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 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 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 4,272 3,711
Interest cost 1,950 1,867 5,850 5,601
Expected return on plan assets (1,953) (1,843) (5,859) (5,529)
Amortization:        
Amortization of prior service cost (11) 6 (33) 18
Amortization of net actuarial loss 1,680 1,338 5,040 4,014
Net benefit cost 3,090 2,605 9,270 7,815
Other Postretirement [Member]
        
Net periodic benefit cost [Abstract]        
Service cost 182 158 546 474
Interest cost 321 313 963 939
Expected return on plan assets 0 0 0 0
Amortization:        
Amortization of prior service cost (113) (119) (339) (357)
Amortization of net actuarial loss 134 102 402 306
Net benefit cost 524 454 1,572 1,362
Benefit plan contributions [Abstract]        
Supplemental Retirement Plan     0  
Other Postretirement Plan     730  
Pension Plan 400   400  
Additional benefit plan contribution for the remainder of fiscal 2012 400   400  
Supplemental Retirement [Member]
        
Benefit plan contributions [Abstract]        
Supplemental Retirement Plan     547  
Other Postretirement Plan     0  
Pension Plan 181   181  
Additional benefit plan contribution for the remainder of fiscal 2012 $ 181   $ 181