Quarterly report pursuant to Section 13 or 15(d)

Long-Term Indebtedness (Details)

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Long-Term Indebtedness (Details) - USD ($)
$ in Thousands
9 Months Ended
May 31, 2017
May 31, 2016
Aug. 31, 2016
Debt Instrument [Line Items]      
Repayments of Senior Debt $ 500    
Total Senior Indebtedness 572,559   $ 584,309
Less: Current maturities of long-term debt (30,000)   (18,750)
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net (3,307)   (3,878)
Line of Credit      
Debt Instrument [Line Items]      
Total Senior Indebtedness 285,000   296,250
Line of Credit | Senior Credit Facility - Revolver      
Debt Instrument [Line Items]      
Total Senior Indebtedness 0   0
Line of Credit | Senior Credit Facility - Term Loan      
Debt Instrument [Line Items]      
Total Senior Indebtedness 285,000   296,250
Senior Notes | 5.625% Senior Notes      
Debt Instrument [Line Items]      
Repayments of Senior Debt (500) $ 0  
Senior Notes, Noncurrent $ 287,600   $ 288,100