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Summary of Business and Significant Accounting Policies (Product Warranty Expense) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2023 | Jan. 31, 2022 | Jan. 31, 2021
Warranty [Line Items] |  |  |
Accrued warranty balance | $ 600,000 | $ 600,000 | $ 700,000
Current portion of warranty reserve | $ 250,000 | $ 250,000 |
Maximum |  |  |
Warranty [Line Items] |  |  |
Product warranty period | 10 years |  |

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