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Debt (Details)
12 Months Ended
Aug. 31, 2016
USD ($)
Aug. 31, 2015
USD ($)
Aug. 31, 2014
USD ($)
Nov. 16, 2015
USD ($)
May 13, 2015
USD ($)
Debt Instrument [Line Items]          
Net proceeds from revolving credit facility $ 14,000,000 $ 10,000,000 $ 35,000,000    
Revolving credit facility, amount outstanding 122,000,000        
Line of credit, long-term liability $ 122,000,000 $ 108,000,000      
Second Amended Credit Facility [Member]          
Debt Instrument [Line Items]          
Revolving credit facility, amount         $ 150,000,000
Share buy-back plan, amount authorized         $ 125,000,000
Revolving credit facility, expiration date May 13, 2020        
Consolidated leverage ratio 3        
Consolidated interest coverage ratio 3        
Third Amended Credit Facility [Member]          
Debt Instrument [Line Items]          
Revolving credit facility, amount       $ 175,000,000  
Share buy-back plan, amount authorized       $ 150,000,000  
Autoborrow Agreement [Member]          
Debt Instrument [Line Items]          
Net proceeds from revolving credit facility $ 0