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Acquisition of RSI Home Products, Inc. (the "RSI Acquisition") (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 29, 2017 | Jan. 31, 2019 | Jan. 31, 2018 | Jul. 31, 2017 | Jan. 31, 2019 | Jan. 31, 2018 | Apr. 30, 2018 | May 01, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition, cash consideration, net of cash acquired |  |  |  |  | $ 7,182 | $ 57,200 |  |
Goodwill |  | $ 767,612 |  |  | 767,612 |  | $ 767,451 |
Operating income (loss) |  | 27,150 |  | $ 7,720 | 103,141 | 69,369 |  |
Cost of sales |  | 307,227 | $ 242,412 |  | 978,569 | 678,179 |  |
Amortization of debt issuance costs |  |  |  |  | 2,054 | 0 |  |
Acquisition, transaction costs, add-dack, net of tax |  |  |  |  |  | $ 6,600 |  |
Revolving loan facility |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from loan | $ 50,000 |  |  |  |  |  |  |
Outstanding on the Revolving Facility |  | $ 35,000 |  |  | $ 35,000 |  |  |
Credit Agreement | Revolving loan facility |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Outstanding on the Revolving Facility |  |  |  |  |  |  |  | $ 300,000
RSI Home Products, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition, indebtedness assumed | 589,000 |  |  |  |  |  |  |
Consideration transferred, acquisition | 554,200 |  |  |  |  |  |  |
Acquisition, cash consideration, net of cash acquired | $ 364,400 |  |  |  |  |  |  |
Acquisition, shares issued (in shares) | 1,457,568 |  |  |  |  |  |  |
Acquisition, shares issued, amount | $ 189,800 |  |  |  |  |  |  |
Acquisition, share price | $ 130.25 |  |  |  |  |  |  |
Goodwill | $ 767,612 |  |  |  |  |  |  |
Customer receivables | 54,649 |  |  |  |  |  |  |
Customer receivables, allowance for doubtful accounts | 2,400 |  |  |  |  |  |  |
RSI Home Products, Inc. | Revolving loan facility |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from loan | 50,000 |  |  |  |  |  |  |
RSI Home Products, Inc. | Revolving Facility | Revolving loan facility |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | 100,000 |  |  |  |  |  |  |
RSI Home Products, Inc. | Revolving Facility | Letter of credit |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | 25,000 |  |  |  |  |  |  |
RSI Home Products, Inc. | Term loan | Initial Term Loan |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 250,000 |  |  |  |  |  |  |
Debt term | 5 years |  |  |  |  |  |  |
RSI Home Products, Inc. | Term loan | Delayed Draw Term Loan |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 250,000 |  |  |  |  |  |  |
Pro forma |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Effective income tax rate, proportional federal rate |  |  |  |  |  | 34.40% |  |

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