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Leases - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2021
Jan. 26, 2020
Leases [Abstract]    
Cash paid for amounts included in the measurement of lease liabilities $ 4,909 $ 5,189
Right-of-use assets obtained in exchange for new operating lease liabilities 9,209 3,366
Right Of Use Asset, Write Down $ 0 $ 1,363
Weighted-average remaining lease term–operating leases 5 years 10 months 9 days  
Weighted-average discount rate on remaining lease payments–operating leases 7.20%