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Accumulated Other Comprehensive Income - Reclassification from AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of revenue $ 5,691,803 $ 5,038,725 $ 17,290,544 $ 15,058,940
Interest expense 50,514 36,178 139,326 110,220
Total amounts 83,078 71,153 348,791 264,854
Income tax expense 39,046 28,451 113,078 120,705
Reclassification out of AOCI | Unrealized losses (gains) on derivative instruments:        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total amounts (1,728) (13,890) 15,958 (28,974)
Gain (loss) to be reclassified in next 12 months     500  
Income tax expense   3,000   10,000
Reclassification out of AOCI | Unrealized losses (gains) on derivative instruments: | Foreign exchange contracts        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of revenue (1,298) (10,459) 17,248 (20,519)
Reclassification out of AOCI | Unrealized losses (gains) on derivative instruments: | Interest rate contracts        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Interest expense $ (430) $ (3,431) $ (1,290) $ (8,455)