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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Jan. 29, 2017	Jan. 28, 2018	Jan. 29, 2017	Apr. 30, 2017
Income Taxes [Line Items]
Unrecognized tax benefits	$ 13,400,000	$ 12,400,000	$ 13,400,000	$ 12,200,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized	1,800,000	9,900,000	1,800,000	467,000
Income tax benefit recognized from reversal of uncertain income tax position	2,100,000		2,100,000
Non-current Deferred Income Taxes [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	11,600,000	2,500,000	11,600,000	11,800,000
Income Taxes Payable - Long-Term [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 1,800,000	$ 9,900,000	$ 1,800,000	$ 467,000
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Income tax examination, description		The IRS proposed an adjustment approximating $12.5 million of income taxes that relates to our transfer pricing with certain foreign subsidiaries. Management does not agree with the IRS' proposed adjustment and intends to vigorously defend its position.
Income tax examination, proposed adjustments		$ 12,500,000
Earliest Tax Year [Member] | United States Federal and State Income Tax [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination		2005
Earliest Tax Year [Member] | Canadian Provincial (Quebec) Returns [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination		2016
Income tax examination, year under examination		2013
Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Income tax examination, year under examination		2014
Earliest Tax Year [Member] | Canada [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination		2014
Earliest Tax Year [Member] | China [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination		2012
Latest Tax Year [Member] | Canadian Provincial (Quebec) Returns [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

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The amount of proposed adjustments resulting from an income tax examination.

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A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings.

+ 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)(2)
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