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Revenue Recognition - Additional Information (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2019	May 01, 2018
Revenue Recognition [Line Items]
Contract assets	$ 1,007,000	$ 4,589,000
Contract liabilities	$ 1,884,000	$ 1,599,000
ASU 2014-09
Revenue Recognition [Line Items]
Cumulative effect adjustment to increase retained earnings			$ 217,000
Fiscal Year 2019
Revenue Recognition [Line Items]
Contract liability recognized as revenue percentage	100.00%

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