Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.20.2
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 04, 2019
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Income Taxes Disclosure [Line Items]          
Income tax expense (benefit)   $ (45) $ 53 $ 21 $ 214
Income tax benefit due to reversal of tax reserves       $ 200  
Preferred shares purchase rights, declared date as dividend Mar. 04, 2019        
Preferred shares purchase rights for each common stock 1        
Preferred shares purchase rights, record date as dividend Mar. 15, 2019        
Tax benefits preservation plan expiration date       Mar. 04, 2022  
Maximum [Member]          
Income Taxes Disclosure [Line Items]          
Income tax expense (benefit)   $ 100   $ 100