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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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