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Stockholders’ Equity (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
Mar. 31, 2014
Feb. 28, 2014
Aug. 31, 2015
May. 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2012
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Jan. 31, 2014
Jan. 16, 2014
Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Stock-based compensation cost recognized                         $ 3,520 $ 3,742 $ 3,630      
Excess tax benefits                         1,000 $ 1,700 $ 1,200      
Unvested unrecognized compensation cost               $ 6,300         $ 6,300          
Unvested unrecognized compensation cost, period                         2 years 1 month 6 days          
Weighted average fair value of stock options granted                         $ 8.83 $ 6.82 $ 4.69      
Proceeds from exercise of stock options                         $ 18,732 $ 17,407 $ 16,343      
Total intrinsic value of options exercised                         21,800 13,000 3,800      
Shares repurchase authorized amount               145,000       $ 40,000 145,000 105,000 40,000 $ 80,000   $ 55,000
Total cost for shares acquired through stock repurchase program                       $ 1,100 $ 123,786 $ 80,045 35,480      
Shares acquired through stock repurchase program                       100            
Weighted-average price per share                         $ 29.46 $ 19.61        
Remaining amount authorized for repurchase through stock repurchase program               $ 126,300         $ 126,300          
Cash dividends declared per common share               $ 0.09 $ 0.09 $ 0.09 $ 0.09   $ 0.27 $ 0.09        
Payment of dividends                         $ 18,808          
Dividends Payable               $ 13         13 $ 4,852        
Accelerated Share Repurchase Program [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Shares repurchase authorized amount             $ 40,000                      
Total cost for shares acquired through stock repurchase program             $ 40,000                      
Shares acquired through stock repurchase program           0 2,100                      
Final price paid per share           $ 19.13                        
Incremental authorization to share repurchase program [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Shares repurchase authorized amount                               $ 40,000    
Treasury Stock [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Total cost for shares acquired through stock repurchase program                         $ 123,786 $ 80,045 $ 35,480      
Shares acquired through stock repurchase program                         4,201 4,080 3,332      
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 $ 0.11                                  
Dividends Payable, Date of Record Nov. 11, 2015                                  
Dividends Payable, Date to be Paid Nov. 20, 2015                                  
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                         $ 1,100 $ 1,100 $ 900      
2006 Plan [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Additional shares authorized                                 6,600  
Shares available for grant               7,600         7,600          
Employee Stock Option [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Vesting period                         3 years          
Board of Director Stock Option [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Vesting period                             1 year      
Minimum [Member] | 2006 Plan [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Contractual term                         7 years          
Maximum [Member] | 2006 Plan [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Contractual term                         10 years          
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