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Acquisition of RSI Home Products, Inc. (the "RSI Acquisition") (Supplemental Pro Forma Financial Information) (Details) - RSI Home Products, Inc. - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2018 | Jan. 31, 2017
Business Acquisition [Line Items] |  |  |
Net Sales |  | $ 1,207,775 | $ 1,213,604
Net Income (1) |  | $ 45,812 | $ 71,945
Net earnings per share - basic |  | $ 2.60 | $ 4.06
Net earnings per share - diluted |  | $ 2.58 | $ 4.03
Pro forma |  |  |
Business Acquisition [Line Items] |  |  |
Stock compensation expense | $ 17,500 | $ 2,600 |

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