Income Taxes [Line Items]

No definition available.

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- Definition

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

+ References

No definition available.

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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=65882285&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=65882285&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=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

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- Definition

Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

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- Definition

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

+ References

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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Apr. 30, 2017	Jan. 29, 2017	Apr. 30, 2017	May 01, 2016	May 03, 2015	Apr. 27, 2014
Income Taxes [Line Items]
Unrecognized tax benefits	$ 12,245,000		$ 12,245,000	$ 14,897,000	$ 14,141,000	$ 13,740,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized	467,000		467,000	3,800,000
Gross amount of interest and penalties due to unrecognized tax benefits	50,000		50,000	978,000
Unrecognized tax benefits for which significant change is reasonably possible	12,200,000		12,200,000
Income tax benefit recognized from reversal of uncertain income tax position	1,300,000	$ 2,100,000	$ 3,431,000
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
Non-current Deferred Income Taxes [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	11,800,000		$ 11,800,000	11,100,000
Income Taxes Payable - Long-Term [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 467,000		$ 467,000	$ 3,800,000