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Acquisition of RSI Home Products, Inc. (the "RSI Acquisition") (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 29, 2017
Jul. 31, 2018
Jul. 31, 2017
Apr. 30, 2018
May 01, 2016
Business Acquisition [Line Items]          
Acquisition, cash consideration, net of cash acquired   $ 7,182 $ 0    
Goodwill   767,914   $ 767,451  
Operating income (loss)   40,527 30,633    
Cost of sales   333,226 218,469    
Amortization of debt issuance costs   700 0    
Acquisition, transaction costs, add-dack, net of tax     $ 300    
Revolving loan facility          
Business Acquisition [Line Items]          
Proceeds from loan $ 50,000        
Outstanding on the Revolving Facility   $ 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 $ 767,914        
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     40.40%