Quarterly report pursuant to Section 13 or 15(d)

Long-Term Indebtedness (Details)

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Long-Term Indebtedness (Details) - USD ($)
$ in Thousands
May. 31, 2015
Aug. 31, 2014
Debt Instrument [Line Items]    
Total Senior Indebtedness $ 600,000 $ 390,000
Less: current maturities of long-term debt 0 (4,500)
Total long-term debt, less current maturities 600,000 385,500
Line of Credit    
Debt Instrument [Line Items]    
Total Senior Indebtedness 300,000 90,000
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 300,000 90,000
Senior Notes | 5.625% Senior Notes    
Debt Instrument [Line Items]    
Total Senior Indebtedness $ 300,000 $ 300,000