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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2017	May 01, 2016
Income Taxes [Line Items]
U.S. foreign income tax credits	$ 1,436,000	$ 1,436,000
U.S. foreign income tax credits, expiration period	9 years
U.S. foreign income tax credits, expiration fiscal year	2026
Alternative minimum tax credit carryforward	$ 1,428,000	1,320,000
Non-current deferred income tax asset	419,000	2,319,000
Non-current deferred income tax liability	3,593,000	1,483,000
U.S. Tax Authorities [Member]
Income Taxes [Line Items]
Operating loss carryforwards	9,000,000
Operating loss carryforwards, related future tax benefits	3,800,000
Non-current deferred income tax asset		1,700,000
Non-current deferred income tax liability	1,500,000
China [Member]
Income Taxes [Line Items]
Non-current deferred income tax asset	419,000	572,000
Canada [Member]
Income Taxes [Line Items]
Non-current deferred income tax liability	$ 2,100,000	$ 1,483,000
Minimum [Member] | U.S. Tax Authorities [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration period	9 years
Maximum [Member] | U.S. Tax Authorities [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration period	18 years
Earliest Tax Year [Member] | U.S. Tax Authorities [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration fiscal year	2027
Latest Tax Year [Member] | U.S. Tax Authorities [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration fiscal year	2035

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