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Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Reversal of valuation allowance $ 17,500    
U.S.      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Reversal of valuation allowance 17,500    
Allowance for uncollectible accounts receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 15,181 $ 14,134 $ 11,094
Additions and Adjustments Charged to Costs and Expenses 15,867 12,545 6,255
Additions/ (Reductions) Charged to Other Accounts 0 0 0
Write-offs/Reductions Charged to Costs and Expenses (13,827) (11,498) (3,215)
Balance at End of Period 17,221 15,181 14,134
Reserve for excess and obsolete inventory      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 60,940 46,013 32,221
Additions and Adjustments Charged to Costs and Expenses 34,091 35,538 46,030
Additions/ (Reductions) Charged to Other Accounts 0 0 0
Write-offs/Reductions Charged to Costs and Expenses (25,478) (20,611) (32,238)
Balance at End of Period 69,553 60,940 46,013
Valuation allowance for deferred taxes      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 223,487 285,559 344,828
Additions and Adjustments Charged to Costs and Expenses 22,750 18,418 65,300
Additions/ (Reductions) Charged to Other Accounts 58,117 (886) (97,203)
Write-offs/Reductions Charged to Costs and Expenses (16,750) (79,604) (27,366)
Balance at End of Period $ 287,604 $ 223,487 $ 285,559