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Treasury Stock - Additional Information (Details) - USD ($) |  |  | 6 Months Ended
--- | --- | --- | ---
Mar. 25, 2021 | Aug. 29, 2017 | Jul. 31, 2021 | Jul. 31, 2020
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program, number of shares authorized | $ 25,000,000.0 |  |  |
Stock repurchase program, total cost of shares repurchased |  |  | $ 9,975,000 |
Stock repurchase program expiration date | Sep. 30, 2022 |  |  |
Existing Share Repurchase Program |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program, number of shares authorized |  | $ 50,000,000.0 |  |
Stock repurchase program, total cost of shares repurchased |  |  | $ 10,000,000.0 |
Stock repurchase program expiration date |  | Aug. 29, 2020 |  |
Stock repurchase program, number of shares repurchased |  |  | 334,000 | 0
Stock repurchase program, average per share price of shares repurchased |  |  | $ 29.87 |
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 15,000,000.0 |
Surrender of Shares by Employee |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program, number of shares repurchased |  |  | 54,720 | 47,302

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