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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Valuation Allowance for Doubtful Accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 163,644 $ 106,445 $ 103,639
Additions: Charged to Costs and Expenses 191,581 65,725 8,132
Deductions: Write-offs, net of Recoveries (129,499) (8,526) (5,326)
Balance at End of Year 225,726 163,644 106,445
Valuation Allowance of Deferred Tax Assets      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 194,277 98,023 111,509
Additions: Charged to Costs and Expenses 112,899 120,300 21,884
Deductions: Write-offs, net of Recoveries (22,460) (24,046) (35,370)
Balance at End of Year 284,716 194,277 $ 98,023
Reserve for Other Supplier Advance Payments [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 0    
Additions: Charged to Costs and Expenses 130,705    
Deductions: Write-offs, net of Recoveries 0    
Balance at End of Year $ 130,705 $ 0