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Acquisition of RSI Home Products, Inc. (the "RSI Acquisition") (Supplemental Pro Forma Financial Information) (Details) - RSI Home Products, Inc. [Member] $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 30, 2018 USD ($) $ / shares
Business Acquisition [Line Items] |
Net Sales | $ 1,613,663
Net Income | $ 67,388
Net earnings per share - basic (usd per share) | $ / shares | $ 3.83
Net earnings per share - diluted (usd per share) | $ / shares | $ 3.80
Pro Forma [Member] |
Business Acquisition [Line Items] |
Stock compensation expense | $ 17,500

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