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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Allowance for doubtful accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 2,280 $ 2,315 $ 2,496
Charges to cost and expenses 323 126 131
Deductions (17) (161) (312)
Balance at end of period 2,586 2,280 2,315
Deferred tax valuation allowance      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 67,348 83,891 75,278
Charges to cost and expenses 0 690 8,613
Deductions (50,864) (17,233) 0
Balance at end of period $ 16,484 $ 67,348 $ 83,891