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Stock-Based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 05, 2017
Tranche
$ / shares
shares
Apr. 28, 2017
$ / shares
shares
Dec. 08, 2016
shares
Oct. 21, 2016
$ / shares
shares
Mar. 10, 2016
$ / shares
shares
Jan. 29, 2016
$ / shares
shares
Jan. 19, 2016
$ / shares
shares
Jan. 31, 2018
USD ($)
$ / shares
shares
Jan. 31, 2017
USD ($)
Jan. 31, 2018
USD ($)
$ / shares
shares
Jan. 31, 2017
USD ($)
$ / shares
Jul. 31, 2017
Tranche
$ / shares
shares
Jul. 31, 2016
shares
Aug. 01, 2017
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Stock-based compensation expense | $               $ 2,000 $ 1,700 $ 3,593 $ 3,087      
Share based compensation, related tax benefits | $               600 $ 600 1,000 $ 1,100      
Unrecognized compensation costs related to outstanding stock awards | $               $ 10,100   $ 10,100        
Weighted average period for recognition of compensation cost                   1 year 9 months 18 days        
Series Award One                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Expected percentage of vesting                       184.00% 196.00%  
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%                       151.00%  
Series Award Four | Second Tranche                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Expected percentage of vesting 172.00%                     184.00%    
Performance-based Restricted Stock Unit ("RSU") Awards                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Target number of shares outstanding, non vested               472,773   472,773       373,698
Awards vested                   0        
Stock issued during period shares for each unit converted                   1        
Target Award Shares                   9,877     58,805  
Weighted average per share grant date fair value | $ / shares               $ 30.72   $ 30.72       $ 25.49
Grant Date Fair Value | $ / shares                   $ 54.09 $ 29.64      
Awards granted, shares                   69,083        
Performance-based Restricted Stock Unit ("RSU") Awards | 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%  
Target Award Shares     10,531   14,625 57,163                
Expected percentage of vesting [1]                   184.00%     196.00%  
Grant Date Fair Value | $ / shares         $ 21.89 $ 21.80       $ 34.95        
Performance-based Restricted Stock Unit ("RSU") Awards | 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 [1] 100.00%           151.00%              
Grant Date Fair Value | $ / shares $ 54.09           $ 20.89              
Performance-based Restricted Stock Unit ("RSU") Awards | Series Award Four                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Number of tranches | Tranche 2                     2    
Performance-based Restricted Stock Unit ("RSU") Awards | 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%                     200.00%    
Target Award Shares 27,542 4,546   44,337           43,926        
Expected percentage of vesting [1] 172.00%                 184.00%        
Grant Date Fair Value | $ / shares $ 54.09 $ 52.55   $ 29.11                    
Performance Based Stock Awards                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Expected percentage of vesting 100.00%           150.00%              
Weighted average per share grant date fair value of performance share awards forfeited | $ / shares                   $ 27.47 $ 25.85      
Performance Based Stock Awards | 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 Based Stock Awards | Series Award Three                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Target Award Shares 4,000                          
Performance Based Stock Awards | Series Award Three | Christopher T. Fraser | Debt Payments                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Target Award Shares 10,000                          
Time Based Stock Awards                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Target number of shares outstanding, non vested               163,646   163,646   173,603    
Awards vested [2]                   15,672        
Target Award Shares [3]                   6,100        
Weighted average per share grant date fair value | $ / shares               $ 24.30   $ 24.30   $ 24.37    
Grant Date Fair Value | $ / shares [3]                   56.69        
Weighted average per share grant date fair value of performance share awards forfeited | $ / shares                   $ 31.39        
Total fair value of shares vested | $                   $ 600 $ 500      
[1] The percentage vesting for performance-based RSU awards is currently estimated at 184% and 196% of the target award for Series 1 awards granted in fiscal years 2017 and 2016, respectively, 100% and 151% of the target award for Series 3 awards granted in fiscal years 2018 and 2016, respectively, 100% and 172% of the target award for the first and second tranches, respectively, of the Series 4 awards granted in fiscal year 2018, and 100% and 184% of the target award for the first and second tranches, respectively, of the Series 4 awards granted in fiscal year 2017.
[2] Includes 4,100 shares granted to non-employee directors for service for the six months ended January 31, 2018. The shares vest on the date of grant, and the Company recognizes compensation expense on such date. Includes 11,572 time-based RSU awards granted to certain employees and executives, and the Company recognizes compensation expense related to the awards over the respective service periods in accordance with GAAP. Upon vesting, each RSU was converted to one share of common stock.
[3] Includes 4,100 shares granted to non-employee directors for service during the six months ended January 31, 2018.