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Revenue From Contracts with Customers - Schedule of Impacts of Adoption of New Accounting Pronouncement (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Sep. 30, 2018
Sep. 29, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Contract assets $ 82,775   $ 76,417 $ 0
Inventories, net 798,271   725,387 794,346
Other accrued liabilities 83,004   67,806 68,163
Retained earnings 1,092,287   1,070,061 $ 1,062,246
Net sales 765,544 $ 677,294    
Cost of sales 693,161 613,771    
Gross profit 72,383 63,523    
Operating income 36,951 31,557    
Income before income taxes 34,115 29,041    
Income tax expense 11,889 127,534    
Net income (loss) 22,226 $ (98,493)    
ASU 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Contract assets 82,775      
Inventories, net (74,152)      
Other accrued liabilities 11      
Retained earnings 8,612      
Net sales 6,185      
Cost of sales 5,194      
Gross profit 991      
Operating income 991      
Income before income taxes 991      
Income tax expense 194      
Net income (loss) 797      
Balance without the adoption of ASU 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Contract assets 0      
Inventories, net 872,423      
Other accrued liabilities 82,993      
Retained earnings 1,083,675      
Net sales 759,359      
Cost of sales 687,967      
Gross profit 71,392      
Operating income 35,960      
Income before income taxes 33,124      
Income tax expense 11,695      
Net income (loss) $ 21,429      
Adjustments due to the adoption of ASU 2014-09 | ASU 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Contract assets     76,417  
Inventories, net     (68,959)  
Other accrued liabilities     (357)  
Retained earnings     $ 7,815