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Delivery Costs (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019
Other Income and Expenses [Abstract] |  |  |  |
Shipping and classroom delivery costs | $ 6,014,000 | $ 7,897,000 | $ 12,999,000 | $ 17,154,000

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- Definition Shipping And Classroom Delivery Costs + References No definition available. + Details
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