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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 |  |

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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 + Details
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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 + Details
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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 + Details
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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 + Details
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