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Stockholders’ Equity (Deficit) (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 16, 2015
Jul. 31, 2015
Feb. 28, 2015
Jan. 31, 2015
Oct. 31, 2014
Aug. 31, 2016
May 31, 2016
Feb. 29, 2016
Nov. 30, 2015
Aug. 31, 2015
May 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Stock-based compensation cost recognized                           $ 3,766 $ 3,520 $ 3,742
Excess tax benefits                           1,200 $ 1,000 $ 1,700
Unvested unrecognized compensation cost           $ 7,100               $ 7,100    
Unvested unrecognized compensation cost, period                           2 years    
Weighted average fair value of stock options granted                           $ 8.23 $ 8.83 $ 6.82
Proceeds from exercise of stock options                           $ 3,842 $ 18,732 $ 17,407
Total intrinsic value of options exercised                           18,900 21,800 13,000
Shares repurchase authorized amount             $ 155,000     $ 145,000         145,000 105,000
Total cost for shares acquired through stock repurchase program                           $ 148,345 $ 123,786 $ 80,045
Weighted-average price per share                           $ 28.48 $ 29.46  
Remaining amount authorized for repurchase through stock repurchase program           $ 132,900               $ 132,900    
Cash dividends declared per common share           $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.44 $ 0.27 $ 0.09
Payment of dividends                           $ 21,309 $ 18,808  
Dividends Payable           $ 44       $ 13       44 13 $ 4,852
Treasury Stock [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Total cost for shares acquired through stock repurchase program                           $ 148,345 $ 123,786 $ 80,045
Shares acquired through stock repurchase program                           5,209 4,201 4,080
October 2014 Accelerated Share Repurchase Program [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares repurchase authorized amount         $ 15,000                      
Total cost for shares acquired through stock repurchase program         $ 15,000                      
Shares acquired through stock repurchase program       0 600                      
Cash payment at completion of accelerated share repurchase program       $ 100                        
Final price paid per share       $ 26.32                        
February 2015 Accelerated Share Repurchase Program [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares repurchase authorized amount     $ 75,000                 $ 75,000        
Total cost for shares acquired through stock repurchase program     $ 75,000                          
Shares acquired through stock repurchase program   300 2,100                          
Final price paid per share   $ 31.38                            
Subsequent Event [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Cash dividends declared per common share $ 0.14                              
Dividends Payable, Date of Record Nov. 09, 2016                              
Dividends Payable, Date to be Paid Nov. 18, 2016                              
Restricted Stock Units [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Vesting period                           3 years    
Aggregate fair value of vested restricted stock                           $ 400 $ 1,100 $ 1,100
2006 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares available for grant           7,000               7,000    
Employee Stock Option [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Contractual term                           7 years    
Vesting period                           3 years    
Board of Director Stock Option [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Contractual term                           7 years    
Vesting period                           1 year    
Board of Director Restricted Stock Unit [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Vesting period                           1 year    
Employee Stock [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Discount price percentage                           15.00%    
Shares available for grant           800               800    
Employee Stock [Member] | Maximum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Compensation percentage           10.00%               10.00%    
Stock’s fair market value           $ 25               $ 25