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Acquisition of RSI Home Products, Inc. (the "RSI Acquisition") (Supplemental Pro Forma Financial Information) (Details) - RSI Home Products, Inc.
$ / shares in Units, $ in Thousands
9 Months Ended
Jan. 31, 2018
USD ($)
$ / shares
Business Acquisition [Line Items]  
Net Sales | $ $ 382,618
Net Income (loss) (1) | $ $ (1,507)
Net earnings per share - basic | $ / shares $ (0.09)
Net earnings per share - diluted | $ / shares $ (0.08)