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Equities Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2019
Nov. 30, 2018
Feb. 28, 2018
Nov. 30, 2017
Feb. 28, 2019
Feb. 28, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning Balance $ 8,292,092 $ 8,165,028 $ 7,742,948 $ 7,705,640 $ 8,165,028 $ 7,705,640
Other comprehensive income (loss), net of tax 14,884 389 10,111 3,019 15,273 13,130
Ending Balance 8,402,229 8,292,092 7,866,357 7,742,948 8,402,229 7,866,357
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning Balance (137,818) (140,335) (130,850) (132,444) (140,335) (132,444)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 102 175 0 0    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 2,564 2,565 4,451 4,214    
Other Comprehensive Income (Loss), before Tax 2,666 2,740 4,451 4,214    
Other Comprehensive Income (Loss), Tax (664) (639) (1,309) (2,620)    
Other comprehensive income (loss), net of tax 2,002 2,101 3,142 1,594    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   416        
Ending Balance (135,816) (137,818) (127,708) (130,850) (135,816) (127,708)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning Balance 0 8,861 13,681 10,041 8,861 10,041
Other Comprehensive Income (Loss), before Reclassifications, before Tax 0 0 6,562 4,044    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0 (1,527) 0    
Other Comprehensive Income (Loss), before Tax 0 0 5,035 4,044    
Other Comprehensive Income (Loss), Tax 0 0 (1,481) (404)    
Other comprehensive income (loss), net of tax 0 0 3,554 3,640    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   (8,861)        
Ending Balance 0 0 17,235 13,681 0 17,235
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning Balance (6,206) (5,882) (6,958) (6,954) (5,882) (6,954)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 18,954 (317) 1,081 (435)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (5,677) (1,475) 425 429    
Other Comprehensive Income (Loss), before Tax 13,277 (1,792) 1,506 (6)    
Other Comprehensive Income (Loss), Tax (3,308) 485 (443) 2    
Other comprehensive income (loss), net of tax 9,969 (1,307) 1,063 (4)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   983        
Ending Balance 3,763 (6,206) (5,895) (6,958) 3,763 (5,895)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning Balance (60,208) (62,559) (53,214) (51,003) (62,559) (51,003)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 3,176 (25) 2,774 (612)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0 0 (2,042)    
Other Comprehensive Income (Loss), before Tax 3,176 (25) 2,774 (2,654)    
Other Comprehensive Income (Loss), Tax (263) (380) (422) 443    
Other comprehensive income (loss), net of tax 2,913 (405) 2,352 (2,211)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   2,756        
Ending Balance (57,295) (60,208) (50,862) (53,214) (57,295) (50,862)
Accumulated Other Comprehensive Income (Loss) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning Balance (204,232) (199,915) (177,341) (180,360) (199,915) (180,360)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 22,232 (167) 10,417 2,997    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (3,113) 1,090 3,349 2,601    
Other Comprehensive Income (Loss), before Tax 19,119 923 13,766 5,598    
Other Comprehensive Income (Loss), Tax (4,235) (534) (3,655) (2,579)    
Other comprehensive income (loss), net of tax 14,884 389 10,111 3,019    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   (4,706)        
Ending Balance $ (189,348) $ (204,232) $ (167,230) $ (177,341) $ (189,348) $ (167,230)