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Equities - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance $ 8,819,173 $ 8,617,530 $ 8,165,028
Other comprehensive loss, net of tax 17,533 (6,991) (22,312)
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect    
Balance 9,017,326 8,819,173 8,617,530
Pension and Other Postretirement Benefits      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 4,048 (4,751) (51,118)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 20,256 19,908 10,279
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance (159,680) (172,478) (140,335)
Other Comprehensive Income (Loss), before Tax 24,304 15,157 (40,839)
Tax effect (6,009) (2,359) 8,280
Other comprehensive loss, net of tax 18,295 12,798 (32,559)
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect     416
Balance (141,385) (159,680) (172,478)
Cash Flow Hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 11,700 16,430 37,709
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (19,753) (22,291) (9,843)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance 10,886 15,297 (5,882)
Other Comprehensive Income (Loss), before Tax (8,053) (5,861) 27,866
Tax effect 1,991 1,450 (7,670)
Other comprehensive loss, net of tax (6,062) (4,411) 20,196
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect     983
Balance 4,824 10,886 15,297
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 5,573 (17,021) (9,990)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0 0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance (85,130) (69,752) (62,559)
Other Comprehensive Income (Loss), before Tax 5,573 (17,021) (9,990)
Tax effect (273) 1,643 41
Other comprehensive loss, net of tax 5,300 (15,378) (9,949)
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect     2,756
Balance (79,830) (85,130) (69,752)
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 21,321 (5,342) (23,399)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 503 (2,383) 436
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance (233,924) (226,933) (199,915)
Other Comprehensive Income (Loss), before Tax 21,824 (7,725) (22,963)
Tax effect (4,291) 734 651
Other comprehensive loss, net of tax 17,533 (6,991) (22,312)
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect     (4,706)
Balance $ (216,391) (233,924) (226,933)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance   $ 0 8,861
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     (8,861)
Balance     $ 0