Income Taxes [Line Items]

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- Definition

Tax year being audited in the income tax examination, in CCYY format.

+ References

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- Definition

Tax year that remains open to examination under enacted tax laws, in CCYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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- Definition

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($)	3 Months Ended
	Jul. 30, 2017	Apr. 30, 2017	Jul. 31, 2016
Income Taxes [Line Items]
Unrecognized tax benefits	$ 12,400,000	$ 12,200,000	$ 15,000,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized	487,000	467,000	3,800,000
Unrecognized tax benefits for which significant change is reasonably possible	12,400,000
Non-current Deferred Income Taxes [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	11,900,000	11,800,000	11,200,000
Income Taxes Payable - Long-Term [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 487,000	$ 467,000	$ 3,800,000
Earliest Tax Year [Member] \| Canada [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination	2013
Income tax examination, year under examination	2013
Earliest Tax Year [Member] \| China [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination	2012
Earliest Tax Year [Member] \| Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Income tax examination, year under examination	2014
Latest Tax Year [Member] \| Canada [Member]
Income Taxes [Line Items]
Income tax examination, year under examination	2015
Latest Tax Year [Member] \| Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Income tax examination, year under examination	2016
United States Federal and State Income Tax [Member] \| Earliest Tax Year [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination	2005