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Revenue Recognition - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Oct. 27, 2018	Oct. 27, 2018	Apr. 28, 2018	Jan. 31, 2018
Disaggregation of Revenue [Line Items]
Standard payment terms		30 days
Contract liabilities and extended warranties	$ 374,000	$ 374,000		$ 367,000
Revenue recognized		610,000
Contract assets balance				$ 832,000
Deferred incremental direct costs			$ 150,000
Amortization of incremental direct costs	50,000	65,000
Deferred incremental direct costs net of accumulated amortization	$ 916,000	$ 916,000
Amortization period of contract costs	8 years	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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