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Description of Business and Summary of Significant Accounting Policies (Reclassification from AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Operating income $ (701,356) $ (542,153) $ (410,230)
Cost of revenue 23,368,919 20,388,624 17,517,478
Interest expense 188,730 149,002 138,074
Actuarial loss 741 1,127 1,929
Prior service credit (44) (88) (138)
Total amounts reclassified from AOCI (450,704) (373,401) (256,233)
Income tax expense (161,230) (285,860) (129,066)
Reclassification out of AOCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Total amounts reclassified from AOCI 54,289 (22,037) 26,626
Reclassification out of AOCI | Foreign currency translation adjustment      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Operating income 0 0 5,947
Reclassification out of AOCI | Realized losses (gains) on derivative instruments      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Loss to be reclassified in next 12 months 17,000    
Income tax expense   14,800  
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Foreign exchange contracts      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Cost of revenue 21,982 (9,379) 4,799
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Interest rate contracts      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Interest expense (1,723) (13,697) 3,950
Reclassification out of AOCI | Actuarial loss      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Actuarial loss 741 1,127 1,929
Reclassification out of AOCI | Prior service credit      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Prior service credit (44) (88) (138)
Reclassification out of AOCI | Available for sale securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Available for sale securities $ 33,333 $ 0 $ 10,139