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Stock-Based Compensation - Additional Information (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 08, 2016
$ / shares
shares
Oct. 21, 2016
$ / shares
shares
Aug. 05, 2016
shares
Mar. 10, 2016
$ / shares
shares
Jan. 29, 2016
$ / shares
shares
Jan. 19, 2016
$ / shares
shares
Oct. 01, 2015
shares
Mar. 26, 2015
$ / shares
shares
Dec. 09, 2014
$ / shares
shares
Jan. 31, 2017
USD ($)
$ / shares
shares
Jan. 31, 2016
USD ($)
Jan. 31, 2017
USD ($)
Tranche
$ / shares
shares
Jan. 31, 2016
USD ($)
$ / shares
Jul. 31, 2016
$ / shares
shares
Jul. 31, 2015
shares
Aug. 01, 2016
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Stock-based compensation expense | $                   $ 1,700,000 $ 1,400,000 $ 3,087,000 $ 2,297,000      
Share based compensation, related tax benefits | $                   595,000 $ 482,000 1,100,000 $ 816,000      
Unrecognized compensation costs related to outstanding stock awards | $                   $ 9,000,000   $ 9,000,000        
Weighted average period for recognition of compensation cost                       2 years 29 days        
Series Award One                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Maximum award, as a percentage of target award                       200.00%   200.00% 167.00%  
Expected percentage of vesting                       100.00%   188.00% 163.00%  
Series Award Three                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Maximum award, as a percentage of target award           200.00%                    
Expected percentage of vesting                       100.00%   100.00%    
Series Award Four                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Expected percentage of vesting                       100.00%        
Performance Shares                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Target number of shares outstanding, non vested                   503,556   503,556       328,731
Awards vested                       0        
Target Award Shares                           66,438 112,237  
Shares award vesting period                       1 year   1 year 1 year  
Expected percentage of vesting                           100.00%    
Weighted average per share grant date fair value | $ / shares                   $ 22.44   $ 22.44       $ 17.36
Grant Date Fair Value | $ / shares                       29.64 $ 21.06      
Weighted average per share grant date fair value of performance share awards forfeited | $ / shares                       $ 25.85 $ 21.90      
Performance Shares | Christopher T. Fraser                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Number of fully vested shares issued     14,000       14,000                  
Performance Shares | Christopher T. Fraser | Two Thousand Four Long Term Incentive Plan | Maximum                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Target Award Shares                       10,000   10,000 10,000  
Performance Shares | Christopher T. Fraser | Certain Organizational Objectives | Minimum                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Target Award Shares                       4,000   4,000 4,000  
Performance Shares | Christopher T. Fraser | Cumulative Revenue and Stockholder Return                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Target Award Shares           82,938                    
Performance Shares | Series Award One                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Target Award Shares 10,531     14,625 57,163     21,173 103,499              
Expected percentage of vesting 100.00%                         188.00% 163.00%  
Grant Date Fair Value | $ / shares $ 34.95     $ 21.89 $ 21.80     $ 25.85 $ 17.81              
Performance Shares | Series Award Three                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Target Award Shares   14,000       82,938                    
Expected percentage of vesting   100.00%       100.00%           100.00%        
Grant Date Fair Value | $ / shares   $ 29.11       $ 20.89                    
Performance Shares | Series Award Four                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Target Award Shares   88,674                            
Expected percentage of vesting   100.00%                            
Number of tranches | Tranche                       2        
Grant Date Fair Value | $ / shares   $ 29.11                            
Performance Shares | Series Award Four | Second Tranche                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Maximum award, as a percentage of target award                       200.00%        
Time Based Shares                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Target number of shares outstanding, non vested                   211,447   211,447   211,368    
Awards vested [1]                       18,474        
Target Award Shares [2]                       18,803        
Weighted average per share grant date fair value | $ / shares                   $ 22.00   $ 22.00   $ 21.28    
Grant Date Fair Value | $ / shares [2]                       33.25        
Weighted average per share grant date fair value of performance share awards forfeited | $ / shares                       $ 25.85        
Total fair value of shares vested | $                       $ 461,000 $ 694,000      
[1] Includes 8,224 shares granted to non-employee directors for service for the six months ended January 31, 2017. The shares vest on the date of grant, and the Company recognizes compensation expense related to the awards over the respective service periods in accordance with GAAP. Includes 10,250 shares granted to certain employees and executives.
[2] Includes 8,224 shares granted to non-employee directors for service during the six month period ended January 31, 2017.