Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Expense - Additional Information (Detail)

v3.21.2
Stock-Based Compensation Expense - Additional Information (Detail)
$ in Millions
6 Months Ended
Jul. 31, 2021
USD ($)
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share-based awards fair value | $ $ 2.6
Deferred Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized | $ $ 0.1
Share based compensation arrangement by share based payment award expected weighted average recognition period 8 months 12 days
Stock Options [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Options granted 1,080,000
Cancelled option awards 1,320,335
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized | $ $ 0.6
Share based compensation arrangement by share based payment award expected weighted average recognition period 1 year 10 months 24 days
Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Awards granted 1,049,088
Stock options and restricted stock units cancelled 171,308
Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized | $ $ 0.6
Share based compensation arrangement by share based payment award expected weighted average recognition period 1 year 6 months
Performance Stock Unit [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized | $ $ 0.1
Share based compensation arrangement by share based payment award expected weighted average recognition period 1 year 3 months 18 days
2011 Compensation and Incentive Plan [Member] | Stock Compensation Plan | Board of Directions  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share-based compensation arrangement by share-based payment award, number of shares authorized 4,896,878
Share-based compensation arrangement by share-based payment award, number of shares purchased for award 2,396,878
Share-based compensation arrangement by share-based payment award, number of shares available for grant 2,350,000
2011 Compensation and Incentive Plan [Member] | Deferred Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share-based compensation arrangement by Share-based payment award, vesting period 1 year
Compensation And Incentive Plan 2021 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share-based compensation arrangement by share-based payment award, Description Option awards may be granted 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 and not less than 110% of the fair market value per common share on the date of the grant with respect to ISOs granted to employees owning stock possessing more than 10% of the total combined voting power of all classes of stock of the Company.
Share-based compensation arrangement by share based payment award, Option award expiration period 10 years
Compensation And Incentive Plan 2021 [Member] | Minimum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share-based compensation arrangement by Share-based payment award, vesting period 1 year
Share-based compensation arrangement by share-based payment award, purchase price of common stock, percent 100.00%
Compensation And Incentive Plan 2021 [Member] | Maximum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share-based compensation arrangement by Share-based payment award, vesting period 3 years
Compensation And Incentive Plan 2021 [Member] | ISO [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Combined voting power limit 10%
Compensation And Incentive Plan 2021 [Member] | ISO [Member] | Minimum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share-based compensation arrangement by share-based payment award, purchase price of common stock, percent 110%
2015 Employee Stock Purchase Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share-based compensation arrangement by share-based payment award, number of shares available for grant 1,075,024
Share-based compensation arrangement by share-based payment award, Description On each purchase date, eligible employees can purchase our stock at a price per share equal to 85% of the closing price of our common stock on the exercise date, but no less than par value.
Discount percentage from market price of stock 85.00%
Shares purchased under ESPP 5,702
2015 Employee Stock Purchase Plan [Member] | Maximum [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 1,150,000