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Leases - Supplemental cash flow information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2021
Aug. 01, 2020
Jul. 31, 2021
Aug. 01, 2020
Cash paid for amounts included in the measurement of lease liabilities [Abstract]        
Operating cash flows for operating leases $ 93 $ 125 $ 185 $ 231