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Summary of Business and Significant Accounting Policies (Principles of Consolidation and Reclassification) (Details) $ in Millions | 12 Months Ended
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Jan. 31, 2020 USD ($)
Accounting Policies [Abstract] |
Reclassification of prior year sales allowances to cost of goods sold | $ 1.9

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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
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