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Summary of Business and Significant Accounting Policies (Product Warranty Expense) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Warranty [Line Items] |  |  |
Accrued warranty balance | $ 925,000 | $ 1,000,000 | $ 1,000,000
Product Warranty Accrual, Current | $ 400,000 | $ 500,000 |
Minimum [Member] |  |  |
Warranty [Line Items] |  |  |
Product warranty period | 10 years |  |
Maximum [Member] |  |  |
Warranty [Line Items] |  |  |
Product warranty period | 10 years |  |

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