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Revenue Recognition - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Apr. 28, 2018 | Jan. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Standard payment terms | 30 days |
Contract liabilities and extended warranties | $ 301,000 | $ 367,000
Revenue recognized | $ 175,000 |
Contract costs, benefitial term | 10 years |
Amortization of incremental direct costs | $ 9,000 |
Deferred incremental direct costs net of accumulated amortization | $ 973,000 |
Contract assets balance |  | $ 832,000
Amortization period of contract costs | 8 years |
Hardware [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Products warranty period | 12 months |
Maximum [Member] | Airborne Product [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Products warranty period | 5 years |
Maximum [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Percentage of revenue satisfied for services | 9.00% |
Minimum [Member] | Airborne Product [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Products warranty period | 4 years |

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