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

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Income Taxes [Line Items]

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No definition available.

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

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No definition available.

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

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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 15
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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)
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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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-Name Accounting Standards Codification
-Topic 740
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-Paragraph 15A
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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($)	6 Months Ended
	Oct. 29, 2017	Apr. 30, 2017	Oct. 30, 2016
Income Taxes [Line Items]
Unrecognized tax benefits	$ 12,600,000	$ 12,200,000	$ 15,100,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized	487,000	467,000	3,700,000
Unrecognized tax benefits for which significant change is reasonably possible	12,600,000
Non-current Deferred Income Taxes [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	12,100,000	11,800,000	11,400,000
Income Taxes Payable - Long-Term [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 487,000	$ 467,000	$ 3,700,000
Earliest Tax Year [Member] \| United States Federal and State Income Tax [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination	2005
Canada [Member]
Income Taxes [Line Items]
Income tax examination, proposed adjustments	$ 0
Canada [Member] \| Earliest Tax Year [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination	2013
Income tax examination, year under examination	2013
Canada [Member] \| Latest Tax Year [Member]
Income Taxes [Line Items]
Income tax examination, year under examination	2015
China [Member] \| Earliest Tax Year [Member]
Income Taxes [Line Items]
Income tax returns, years subject to examination	2012
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
Internal Revenue Service (IRS) [Member] \| Earliest Tax Year [Member]
Income Taxes [Line Items]
Income tax examination, year under examination	2014
Internal Revenue Service (IRS) [Member] \| Latest Tax Year [Member]
Income Taxes [Line Items]
Income tax examination, year under examination	2016