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Acquisition of RSI Home Products, Inc. (the "RSI Acquisition") (Narrative) (Details) - USD ($) |  | 3 Months Ended | 4 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 29, 2017 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2018 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017 | Feb. 12, 2018 | May 01, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, net of cash acquired |  |  |  |  |  |  |  |  |  |  | $ 7,182,000 | $ 57,200,000 | $ 0 |  |
Goodwill, net |  | $ 767,612,000 |  |  |  | $ 767,451,000 |  |  |  | $ 767,451,000 | 767,612,000 | 767,451,000 |  |  |
Customer receivables | $ 57,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for returns and discounts | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | 407,399,000 | $ 384,080,000 | $ 424,878,000 | $ 428,962,000 | 405,887,000 | $ 292,791,000 | $ 274,769,000 | $ 276,827,000 |  | 1,645,319,000 | 1,250,274,000 | 1,030,248,000 |  |
Operating profit |  |  |  |  |  |  |  |  |  |  | 141,694,000 | 107,705,000 | 108,238,000 |  |
Charge to cost of sales as a result of the step up of inventory |  |  |  |  |  |  |  |  |  |  | $ 1,298,846,000 | 994,871,000 | 805,612,000 |  |
Transaction costs |  |  |  |  |  |  |  |  |  |  |  | $ 8,500,000 | $ 1,600,000 |  |
Statutory tax rate |  |  |  |  |  |  |  |  |  |  | 21.00% | 30.40% | 35.00% |  |
Amortization expense, net of tax |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 | $ 27,200,000 |  |
Interest expense, net of tax |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 | $ 4,400,000 |  |
RSI Home Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness assumed (including accrued interest) | 589,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total accounting consideration paid | 554,232,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, net of cash acquired | $ 364,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newly issued shares (shares) | 1,457,568 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of newly issued common stock | $ 189,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share (usd per share) | $ 130.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, net | $ 767,612,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 177,700,000 |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  | 9,100,000 |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  |  |  |  | $ 12,900,000 |  |  |  |
Senior Notes [Member] | RSI Home Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from term loan | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowed under the Credit Agreement |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |  |  |
Revolving Credit Facility [Member] | RSI Home Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from term loan | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Revolving Facility [Member] | RSI Home Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowed under the Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000
Letter of Credit [Member] | Revolving Facility [Member] | RSI Home Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable [Member] | Initial Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowed under the Credit Agreement |  | 170,000,000 |  |  |  | 230,000,000 |  |  |  | 230,000,000 | 170,000,000 | 230,000,000 |  |  |
Loans Payable [Member] | Initial Term Loan [Member] | RSI Home Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan facility term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable [Member] | Delayed Draw Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowed under the Credit Agreement |  | $ 170,000,000 |  |  |  | $ 230,000,000 |  |  |  | 230,000,000 | $ 170,000,000 | 230,000,000 |  |  |
Loans Payable [Member] | Delayed Draw Term Loan [Member] | RSI Home Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment to Inventory [Member] | RSI Home Products, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge to cost of sales as a result of the step up of inventory |  |  |  |  |  |  |  |  |  | $ 6,300,000 |  | $ 4,100,000 |  |  |
Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate |  |  |  |  |  |  |  |  |  |  |  | 34.40% | 40.40% |  |

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