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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020 | Jun. 04, 2019 | Aug. 22, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Common shares authorized for repurchase, shares |  |  |  |  | 20,000,000 | 20,000,000
Remaining common shares authorized for repurchase, shares | 25,851,954 |  | 25,851,954 |  |  |
Stock repurchased and retired during period, total cost | $ 144 | $ 22 | $ 7,562 | $ 10,778 |  |
Employee Stock |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchased and retired during period shares |  |  | 222,531 | 155,734 |  |
Stock repurchased and retired during period, total cost |  |  | $ 7,562 | $ 3,742 |  |

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