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Impact of the Coronavirus Pandemic - Summary of Expenses Recorded (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jul. 31, 2020 | Apr. 30, 2020 | Jul. 31, 2020
Extraordinary And Unusual Items [Abstract] |  |  |
Inventory obsolescence reserves | $ (21,673) | $ 43,327 | $ 21,654
Allowance for doubtful accounts | $ (2,200) | 5,800 | 3,600
Store impairment |  | $ 14,528 | $ 14,528

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