Quarterly report pursuant to Section 13 or 15(d)

Stock Incentive Plans - Additional Information (Detail)

v2.4.0.8
Stock Incentive Plans - Additional Information (Detail)
6 Months Ended
Jul. 31, 2014
Jul. 31, 2011
Compensation and Incentive Plan 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement by share-based payment award, number of shares authorized   5,300,000
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 7 years  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 100.00%