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Debt (Details)
$ in Thousands
3 Months Ended
Nov. 30, 2016
USD ($)
Aug. 31, 2016
USD ($)
Nov. 16, 2015
USD ($)
Debt Instrument [Line Items]      
Revolving credit facility, amount outstanding $ 134,400    
Debt Current 12,354    
Line of credit, long-term liability $ 122,000 $ 122,000  
Third Amended Credit Facility [Member]      
Debt Instrument [Line Items]      
Share buy-back plan, amount authorized     $ 150,000
Revolving credit facility, expiration date May 13, 2020    
Consolidated leverage ratio 3    
Consolidated interest coverage ratio 3    
Fourth Amended Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving credit facility, amount $ 18,000    
Line Of Credit, Headquarters Office [Member]      
Debt Instrument [Line Items]      
Debt Current 10,000    
Autoborrow Agreement [Member]      
Debt Instrument [Line Items]      
Debt Current $ 2,400    
Maximum [Member] | Third Amended Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving credit facility, amount     $ 175,000