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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
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