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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 6 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Sep. 30, 2018
Sep. 29, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Contract assets $ 86,803   $ 86,803   $ 76,417 $ 0
Inventories, net 802,261   802,261   725,387 794,346
Other accrued liabilities 92,989   92,989   67,806 68,163
Retained earnings 1,117,045   1,117,045   1,070,061 $ 1,062,246
Net sales 789,051 $ 698,651 1,554,595 $ 1,375,945    
Cost of sales 718,415 645,699 1,411,576 1,259,470    
Gross profit 70,636 52,952 143,019 116,475    
Operating income 33,174 17,315 70,125 48,872    
Income before income taxes 28,696 14,717 62,811 43,758    
Income tax expense 3,938 2,427 15,827 129,961    
Net income (loss) 24,758 $ 12,290 46,984 $ (86,203)    
ASU 2014-09            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Contract assets 86,803   86,803      
Inventories, net (78,766)   (78,766)      
Other accrued liabilities (1,069)   (1,069)      
Retained earnings 9,106   9,106      
Net sales 5,359   11,544      
Cost of sales 4,641   9,835      
Gross profit 718   1,709      
Operating income 718   1,709      
Income before income taxes 718   1,709      
Income tax expense 224   418      
Net income (loss) 494   1,291      
Balance without the adoption of ASU 2014-09            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Contract assets 0   0      
Inventories, net 881,027   881,027      
Other accrued liabilities 94,058   94,058      
Retained earnings 1,107,939   1,107,939      
Net sales 783,692   1,543,051      
Cost of sales 713,774   1,401,741      
Gross profit 69,918   141,310      
Operating income 32,456   68,416      
Income before income taxes 27,978   61,102      
Income tax expense 3,714   15,409      
Net income (loss) $ 24,264   $ 45,693      
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