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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($)	Jul. 30, 2017	Apr. 30, 2017		Jul. 31, 2016
Income Taxes [Line Items]
Non-current deferred tax asset	$ 436,000	$ 419,000	[1]	$ 1,942,000
Non-current deferred tax liability	4,253,000	3,593,000	[1]	1,532,000
U.S. Tax Authorities [Member]
Income Taxes [Line Items]
Non-current deferred tax asset				1,400,000
Non-current deferred tax liability	2,300,000	1,500,000
China [Member]
Income Taxes [Line Items]
Non-current deferred tax asset	436,000	419,000		561,000
Canada [Member]
Income Taxes [Line Items]
Non-current deferred tax liability	$ 2,000,000	$ 2,100,000		$ 1,500,000
[1] Derived from audited financial statements.

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Income Taxes [Line Items]

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting and classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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-Topic 740
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-Section 45
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.

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