XML 77 R59.htm IDEA: XBRL DOCUMENT v3.19.1
Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost $ 9,648,000 $ 9,920,000 $ 19,296,000 $ 19,839,000
Interest cost 7,099,000 5,991,000 14,198,000 11,992,000
Expected return on assets (11,242,000) (12,049,000) (22,484,000) (24,089,000)
Prior service cost (credit) amortization 42,000 360,000 85,000 719,000
Actuarial (gain) loss amortization 3,087,000 4,511,000 6,174,000 11,399,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 169,000   169,000  
Net periodic benefit cost 8,803,000 8,733,000 17,438,000 19,860,000
Defined Benefit Plan, Plan Assets, Contributions by Employer     0  
Non-Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 78,000 137,000 155,000 274,000
Interest cost 187,000 178,000 374,000 356,000
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (19,000) 7,000 (37,000) 15,000
Actuarial (gain) loss amortization 1,000 16,000 1,000 30,000
Net periodic benefit cost 247,000 338,000 493,000 675,000
Other Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 263,000 236,000 527,000 472,000
Interest cost 274,000 227,000 547,000 454,000
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (139,000) (142,000) (278,000) (283,000)
Actuarial (gain) loss amortization (407,000) (306,000) (814,000) (612,000)
Net periodic benefit cost $ (9,000) $ 15,000 $ (18,000) $ 31,000