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Acquisition of RSI Home Products, Inc. (the "RSI Acquisition") (Preliminary Purchase Price Allocation) (Details) - USD ($) $ in Thousands | Dec. 29, 2017 | Apr. 30, 2019 | Apr. 30, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill, net |  | $ 767,612 | $ 767,451
RSI Home Products, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill, net | $ 767,612 |  |
Property, plant and equipment | 86,275 |  |
Inventories | 66,293 |  |
Customer receivables | 54,649 |  |
Income taxes receivable | 18,926 |  |
Prepaid expenses and other | 4,571 |  |
Leasehold interests | 151 |  |
Total identifiable assets and goodwill acquired | 1,282,477 |  |
Debt | 602,313 |  |
Deferred income taxes | 67,542 |  |
Accrued expenses | 30,240 |  |
Accounts payable | 25,113 |  |
Notes payable | 2,988 |  |
Income taxes payable | 49 |  |
Total liabilities assumed | 728,245 |  |
Total accounting consideration | 554,232 |  |
Customer Relationships [Member] | RSI Home Products, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangibles | 274,000 |  |
Trademarks [Member] | RSI Home Products, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangibles | $ 10,000 |  |

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