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Revenue Recognition - Additional Information (Detail) - USD ($)
 6 Months Ended
Aug. 03, 2019
Jan. 31, 2019
Disaggregation of Revenue [Abstract]    
Contract liabilities and extended warranties $ 321,000 $ 373,000
Revenue recognized 412,000  
Contract assets balance 739,000 $ 903,000
Amortization of incremental direct costs 54,000  
Deferred incremental direct contract costs reported in other current assets $ 109,000  
Amortization period of contract costs 7 years  
Deferred incremental direct costs net of accumulated amortization $ 848,000  
Capitalized Contract Costs Benefitial Term 10 years