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Revenue - Effect of New Revenue Guidance, Impact on Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net revenue $ 6,135,602 $ 5,436,952 $ 18,708,867 $ 16,323,585
Cost of revenue 5,691,803 5,038,725 17,290,544 15,058,940
Operating income 140,918 112,971 511,611 388,257
Income tax expense 39,046 28,451 113,078 120,705
Net income 44,032 $ 42,702 235,713 $ 144,149
Balance without the adoption of ASU 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net revenue 6,072,984   18,302,187  
Cost of revenue 5,665,654   16,982,850  
Operating income 104,449   412,625  
Income tax expense 38,015   114,798  
Net income $ 8,594   $ 135,007