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Benefit Plans - Changes in Benefit Obligation and Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Qualified Pension Benefits      
Change in benefit obligation: [Rollforward]      
Benefit obligation at beginning of period $ 720,893 $ 641,284  
Service cost 36,006 30,417 $ 31,387
Interest cost 28,046 29,900 25,445
Actuarial loss (gain) 20,993 1,973  
Assumption change (16,297) 57,406  
Plan Amendments 0 647  
Settlements 0 0  
Benefits Paid (58,846) (40,734)  
Benefit obligation at end of period 730,795 720,893 641,284
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 822,125 730,628  
Actual gain (loss) on plan assets (6,065) 106,531  
Company contributions 39,165 25,700  
Benefits Paid (58,846) (40,734)  
Fair value of plan assets at end of period 796,379 822,125 730,628
Funded Status of Plan 65,584 101,232  
Assets [Abstract]      
Non-current assets 65,927 103,125  
Liabilities [Abstract]      
Current liabilities 0 0  
Non-current liabilities (343) (1,893)  
Ending balance 65,584 101,232  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) 5,217 6,848  
Net loss 276,450 235,564  
Ending balance 281,667 242,412  
Defined Benefit Plan, Settlements, Plan Assets 0 0  
Non-Qualified Pension Benefits      
Change in benefit obligation: [Rollforward]      
Benefit obligation at beginning of period 37,983 36,225  
Service cost 875 860 721
Interest cost 1,414 1,660 1,316
Actuarial loss (gain) 393 393  
Assumption change (1,082) 2,421  
Plan Amendments 0 0  
Settlements (5,715) 0  
Benefits Paid (684) (3,576)  
Benefit obligation at end of period 33,184 37,983 36,225
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 0 0  
Actual gain (loss) on plan assets 0 0  
Company contributions 6,399 3,576  
Benefits Paid (684) (3,576)  
Fair value of plan assets at end of period 0 0 0
Funded Status of Plan (33,184) (37,983)  
Assets [Abstract]      
Non-current assets 0 0  
Liabilities [Abstract]      
Current liabilities (1,752) (3,222)  
Non-current liabilities (31,432) (34,761)  
Ending balance (33,184) (37,983)  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) 631 859  
Net loss 9,161 12,542  
Ending balance 9,792 13,401  
Defined Benefit Plan, Settlements, Plan Assets (5,715) 0  
Other Benefits      
Change in benefit obligation: [Rollforward]      
Benefit obligation at beginning of period 44,318 45,542  
Service cost 1,513 1,729 2,936
Interest cost 1,489 1,918 2,275
Actuarial loss (gain) 1,563 (4,135)  
Assumption change (5,136) 1,425  
Plan Amendments 0 0  
Settlements 0 0  
Benefits Paid (1,750) (2,161)  
Benefit obligation at end of period 41,997 44,318 45,542
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 0 0  
Actual gain (loss) on plan assets 0 0  
Company contributions 1,750 2,161  
Benefits Paid (1,750) (2,161)  
Fair value of plan assets at end of period 0 0 $ 0
Funded Status of Plan (41,997) (44,318)  
Assets [Abstract]      
Non-current assets 0 0  
Liabilities [Abstract]      
Current liabilities (2,708) (2,787)  
Non-current liabilities (39,289) (41,531)  
Ending balance (41,997) (44,318)  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) (472) (592)  
Net loss (10,409) (7,573)  
Ending balance (10,881) (8,165)  
Defined Benefit Plan, Settlements, Plan Assets $ 0 $ 0