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Stockholders' Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 1 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2013
Cashless Exercise
Jul. 31, 2013
Minimum
Jul. 31, 2013
Maximum
Jul. 31, 2013
2010 Equity and Incentive Plan
Jul. 31, 2013
2006 Equity Incentive Plan
Jul. 31, 2013
Stock Option Awards
Jul. 31, 2012
Stock Option Awards
Jul. 31, 2011
Stock Option Awards
Jul. 31, 2013
Restricted Stock Awards
Jul. 31, 2012
Restricted Stock Awards
Jul. 31, 2011
Restricted Stock Awards
Jul. 31, 2013
Restricted Stock Units (RSUs)
Aug. 31, 2011
August 2011 Repurchase Agreement
Jan. 20, 2012
January 2012 Repurchase Agreement
Jan. 18, 2012
January 2012 Repurchase Agreement
Jan. 20, 2012
Catterton Repurchase Agreements
Jan. 18, 2012
Catterton Repurchase Agreements
Equity, Class of Treasury Stock [Line Items]                                        
Common stock purchased, shares                               1,000,000 1,000,000   1,000,000  
Common stock price per share                               $ 20.00 $ 28.50   $ 28.50  
Aggregate purchase price of common stock   $ 77,000                           $ 20,000 $ 28,500   $ 28,500  
Closing price of common stock                               $ 20.62   $ 29.34   $ 29.34
Percentage of issued and outstanding common stock prior to repurchase                               1.80% 1.80%   1.80%  
Number of shares authorized under stock option plan             2,000,000 1,100,000                        
Number of shares available to be granted             1,850,461 30,000                        
Option expiration from the date of grant, in years 10 years                                      
Option vesting period         3 years 5 years           5 years                
Weighted average remaining contractual life of outstanding options, years 4 years 9 months 11 days                                      
Weighted average remaining contractual life of exercisable options, years 4 years 9 months 11 days                                      
Weighted average fair value of options granted     $ 10.80                                  
Options granted during the period 0 0 130,000                                  
Total compensation expenses                 393 645 2,707 133 43 0 2,290          
Unrecognized compensation costs                 0     405                
Cash received from stock option exercises 5,845 1,428 1,047                                  
Total intrinsic value of stock options exercised 7,502 931 1,551                                  
Tax benefits from stock compensation expense 144 224 1,172                                  
Stock option exercised 498,412 80,500 78,500 314,000                                
Stock option value exercised 14,267                                      
Share issued during period       63,464                                
Tax withholding paid on behalf Of employees 2,009                                      
Weighted average recognition period for compensation expenses, years                       3 years 11 months 12 days                
Non-cash compensation expense $ 2,816 $ 688 $ 2,707