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Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Allowance for uncollectible accounts receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 14,134 $ 11,094 $ 11,663
Additions and Adjustments Charged to Costs and Expenses 12,545 6,255 292
Additions/ (Reductions) Charged to Other Accounts 0 0 0
Write-offs/Reductions Charged to Costs and Expenses (11,498) (3,215) (861)
Balance at End of Period 15,181 14,134 11,094
Reserve for excess and obsolete inventory      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 46,013 32,221 43,477
Additions and Adjustments Charged to Costs and Expenses 35,538 46,030 12,145
Additions/ (Reductions) Charged to Other Accounts 0 0 0
Write-offs/Reductions Charged to Costs and Expenses (20,611) (32,238) (23,401)
Balance at End of Period 60,940 46,013 32,221
Valuation allowance for deferred taxes      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 285,559 344,828 304,820
Additions and Adjustments Charged to Costs and Expenses 18,418 65,300 23,891
Additions/ (Reductions) Charged to Other Accounts (886) (97,203) 28,238
Write-offs/Reductions Charged to Costs and Expenses (79,604) (27,366) (12,121)
Balance at End of Period $ 223,487 $ 285,559 $ 344,828