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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 29, 2018 | Apr. 29, 2018 | Apr. 30, 2017 | May 01, 2016 | May 03, 2015
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized | $ 465,000 | $ 465,000 | $ 467,000 |  |
Unrecognized tax benefits | 844,000 | 844,000 | 12,245,000 | $ 14,897,000 | $ 14,141,000
Gross amount of interest and penalties due to unrecognized tax benefits | 40,000 | 40,000 | 50,000 |  |
Non-current Deferred Income Taxes [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits | 379,000 | 379,000 | 11,800,000 |  |
Income Taxes Payable - Long-Term [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits | 465,000 | $ 465,000 | $ 467,000 |  |
Canadian Provincial (Quebec) Returns [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax examination, final adjustments | 4,000 |  |  |  |
U.S. [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax examination, final adjustments | $ 0 |  |  |  |
Earliest Tax Year [Member] | Canadian Provincial (Quebec) Returns [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax examination, year under examination |  | 2013 |  |  |
Earliest Tax Year [Member] | U.S. [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax examination, year under examination |  | 2014 |  |  |
Latest Tax Year [Member] | Canadian Provincial (Quebec) Returns [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax examination, year under examination |  | 2015 |  |  |
Latest Tax Year [Member] | U.S. [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax examination, year under examination |  | 2016 |  |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + 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 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=84230637&loc=d3e32718-109319 + 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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