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Stock-Based Compensation Plans - Total Estimated Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2022 | Jul. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Effect on net income | $ 3,736 | $ 3,015 | $ 6,523 | $ 5,167
Cost of Sales [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Effect on net income | 254 | 199 | 449 | 343
Selling and Marketing Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Effect on net income | 675 | 918 | 1,160 | 1,279
Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Effect on net income | 490 | 388 | 857 | 668
General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Effect on net income | $ 2,317 | $ 1,510 | $ 4,057 | $ 2,877

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