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Debt (Details)
$ in Thousands
6 Months Ended
Feb. 29, 2016
USD ($)
Feb. 28, 2015
USD ($)
Nov. 16, 2015
USD ($)
Aug. 31, 2015
USD ($)
May. 13, 2015
USD ($)
Debt Instrument [Line Items]          
Net proceeds from revolving credit facility $ 14,541 $ 5,000      
Revolving credit facility, amount outstanding 122,500        
Line of credit, short-term liability 4,500        
Line of credit, long-term liability $ 118,000     $ 108,000  
Second Amended Credit Facility [Member]          
Debt Instrument [Line Items]          
Revolving credit facility, amount         $ 150,000
Share buy-back plan, amount authorized         $ 125,000
Third Amended Credit Facility [Member]          
Debt Instrument [Line Items]          
Revolving credit facility, amount     $ 175,000    
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        
Autoborrow Agreement [Member]          
Debt Instrument [Line Items]          
Net proceeds from revolving credit facility $ 2,500