XML 96 R48.htm IDEA: XBRL DOCUMENT v3.20.1
Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Feb. 29, 2020
Feb. 28, 2019
Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost $ 10,538 $ 9,648 $ 21,076 $ 19,296
Interest cost 5,431 7,099 10,861 14,198
Expected return on assets (11,671) (11,242) (23,342) (22,484)
Prior service cost (credit) amortization 45 42 89 85
Actuarial (gain) loss amortization 5,396 3,087 10,791 6,174
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 169 0 169
Net periodic benefit cost 9,739 8,803 19,475 17,438
Non-Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 101 78 203 155
Interest cost 107 187 214 374
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (28) (19) (57) (37)
Actuarial (gain) loss amortization 25 1 49 1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 0 0
Net periodic benefit cost 205 247 409 493
Other Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 262 263 525 527
Interest cost 187 274 374 547
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (111) (139) (223) (278)
Actuarial (gain) loss amortization (348) (407) (696) (814)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 0 0
Net periodic benefit cost $ (10) $ (9) $ (20) $ (18)