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Business Combinations - Schedule of Unaudited Pro Forma Consolidated Results of Operations (Detail) - Read Window Products LLC [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 29, 2018 | Apr. 30, 2017
Business Acquisition [Line Items] |  |
Net Sales | $ 334,953 | $ 321,398
Income from operations | 26,799 | 30,441
Net income | $ 20,455 | $ 22,552
Net income per share, basic | $ 1.65 | $ 1.83
Net income per share, diluted | $ 1.62 | $ 1.80

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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