Income Tax Examination, Years Subject to Examination1

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- Definition

Income Taxes [Line Items]

+ References

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- Definition

Jurisdictions Statute Of Limitations Expiration Month And Year

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- Definition

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

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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.

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

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- Definition

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

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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jan. 29, 2017	Jan. 29, 2017	May 01, 2016	Jan. 31, 2016
Income Taxes [Line Items]
Unrecognized tax benefits	$ 13.4	$ 13.4	$ 14.9	$ 13.2
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized	1.8	1.8	3.8	3.5
Unrecognized tax benefits for which significant change is reasonably possible	13.4	13.4
Income tax benefit recognized from reversal of uncertain income tax position	2.1	$ 2.1
Canadian Federal Returns [Member] \| Minimum [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination		2010
Canadian Provincial (Quebec) Returns [Member]
Income Taxes [Line Items]
Statute of limitations for 2009 income tax, expiration month and year		2017-04
Canadian Provincial (Quebec) Returns [Member] \| Minimum [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination		2009
Income tax examination, year under examination		2013
Canadian Provincial (Quebec) Returns [Member] \| Maximum [Member]
Income Taxes [Line Items]
Income tax examination, year under examination		2015
China Income Tax Returns [Member] \| Minimum [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination		2011
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Income tax examination, year under examination		2014
United States Federal and State Income Tax [Member] \| Minimum [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	11.6	$ 11.6	11.1	9.7
Income Taxes Payable - Long-Term [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 1.8	$ 1.8	$ 3.8	$ 3.5