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Revenue - Effect of New Revenue Guidance, Impact on Income Statement (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net revenue $ 6,066,990 $ 5,301,101 $ 12,573,265 $ 10,886,633
Cost of revenue 5,612,116 4,903,968 11,598,741 10,020,215
Operating income 153,983 129,532 370,693 275,286
Income tax expense 33,219 48,734 74,032 92,254
Net income 67,607 $ 37,528 191,681 $ 101,447
Balance without the adoption of ASU 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net revenue 5,985,439   12,229,174  
Cost of revenue 5,556,714   11,317,170  
Operating income 127,835   308,174  
Income tax expense 36,867   76,783  
Net income $ 37,811   $ 126,411