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Acquisition of RSI Home Products, Inc. (the "RSI Acquisition") (Supplemental Pro Forma Financial Information) (Details) - RSI Home Products, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018
Business Acquisition [Line Items] |  |
Net Sales | $ 1,613,663 | $ 1,623,441
Net Income | $ 67,388 | $ 93,798
Net earnings per share - basic (usd per share) | $ 3.83 | $ 5.30
Net earnings per share - diluted (usd per share) | $ 3.80 | $ 5.26
Pro Forma [Member] |  |
Business Acquisition [Line Items] |  |
Stock compensation expense | $ 17,500 | $ 7,400

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