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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 |  |

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- Definition Tax year being audited in the income tax examination, in CCYY format. + References No definition available. + Details
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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 + 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=65882285&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=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 + Details
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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 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + 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)(4) -URI http://asc.fasb.org/extlink&oid=65882285&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=65882285&loc=SL6600010-109319 + Details
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