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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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- Definition 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) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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