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Debt (Narrative) (Details)
$ in Thousands
6 Months Ended
Feb. 28, 2017
USD ($)
Aug. 31, 2016
USD ($)
Nov. 16, 2015
USD ($)
Debt Instrument [Line Items]      
Revolving credit facility, amount outstanding $ 148,200    
Current debt 14,233    
Line of credit, long-term liability 134,000 $ 122,000  
Revolving credit facility, additional borrowed amount $ 12,000    
Fourth 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    
Capital expenditures $ 7,500    
Line Of Credit, Headquarters Office [Member]      
Debt Instrument [Line Items]      
Current debt 10,000    
Autoborrow Agreement [Member]      
Debt Instrument [Line Items]      
Current debt 4,200    
Maximum [Member] | Fourth Amended Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving credit facility, amount 175,000    
9715 Businesspark Avenue, San Diego [Member] | Fourth Amended Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving credit facility, amount $ 18,000