Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Additional Information (Detail)

v2.4.0.8
Stockholders' Equity - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Sep. 04, 2013
May 31, 2012
Jul. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2014
Employees [Member]
Jan. 31, 2013
Employees [Member]
Jan. 31, 2012
Employees [Member]
Jul. 20, 2011
Compensation and Incentive Plan 2011 [Member]
May 31, 2012
Compensation and Incentive Plan 2011 [Member]
Chief Executive Officer [Member]
Jan. 31, 2014
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Preferred stock, shares authorized       5,000,000                
Preferred stock, shares issued       0                
Stock repurchase program, authorized amount $ 25,000,000                      
Termination date of repurchase program       Jan. 31, 2015                
Stock Repurchased During Period, Shares       0                
Expected dividend yield       0.00% 0.00% 0.00%            
Share-based compensation arrangement by share-based payment award, number of shares authorized       5,300,000           2,800,000    
Increased number of shares authorized for issuance       2,500,000                
Share based compensation arrangement by share based payment award vesting limit per participant       1,250,000 500,000              
Share based compensation arrangement by share based payment award maximum number of shares per participant       1,250,000 500,000              
Share-based compensation arrangement by share-based payment award, number of shares available for grant       3,260,327                
Share-based compensation arrangement by share-based payment award, description       Option awards may be granted to employees at an exercise price per share of not less than 100% of the fair market value per common share on the date of the grant.                
Share-based compensation arrangement by Share-based payment award, award vesting period       3 years                
Share based compensation arrangement by share based payment award, award expiration period       10 years                
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent       100.00%                
Shares, Granted   875,000   12,500 892,500 250,000         875,000  
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value   3,300,000 3,300,000                  
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value       $ 3.89 $ 3.78 $ 2.86            
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized       50,000               4,200,000
Share-based compensation arrangement by share-based payment award, options, exercises in period, total intrinsic value       300,000 500,000 800,000            
Employee service share-based compensation, cash received from exercise of stock options             $ 1,100,000 $ 2,200,000 $ 1,800,000      
Share based compensation arrangement by share based payment award estimated weighted average amortization period                       1 year 1 month 6 days