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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Allowances for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 165,540 $ 176,805 $ 221,813
Additions: Charged to Costs and Expenses 10,175 3,089 57,380
Deductions: Write-offs, Net of Recoveries (31,993) (14,354) (102,388)
Balance at End of Year 143,722 165,540 176,805
Valuation allowance for deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 219,891 246,344 230,374
Additions: Charged to Costs and Expenses 11,700 5,206 41,260
Deductions: Write-offs, Net of Recoveries (22,781) (31,659) (25,290)
Balance at End of Year 208,810 219,891 246,344
Reserve for supplier advance payments      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 65,885 65,885 110,613
Additions: Charged to Costs and Expenses 0 0 0
Deductions: Write-offs, Net of Recoveries 0 0 (44,728)
Balance at End of Year $ 65,885 $ 65,885 $ 65,885