Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Narrative (Details)

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Long-Term Debt - Narrative (Details)
3 Months Ended 6 Months Ended
Dec. 14, 2017
USD ($)
Apr. 22, 2016
USD ($)
Dec. 26, 2015
Nov. 09, 2015
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 30, 2017
Sep. 30, 2017
USD ($)
Mar. 25, 2017
USD ($)
Dec. 31, 2015
USD ($)
Letter of credit                    
Components of long-term debt                    
Letters of credit outstanding         $ 3,300,000 $ 3,300,000        
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021                    
Components of long-term debt                    
Maturity date of senior subordinated notes           Apr. 01, 2021        
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | LIBOR-based borrowings                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility         1.25%          
Applicable interest rate on the credit facility         3.10% 3.10%        
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Base rate borrowings                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility         0.25%          
Applicable interest rate on the credit facility         5.00% 5.00%        
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Minimum | LIBOR-based borrowings                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility           1.25%        
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Minimum | Base rate borrowings                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility           0.25%        
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Maximum | LIBOR-based borrowings                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility           1.50%        
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Maximum | Base rate borrowings                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility           0.75%        
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Revolving credit facility                    
Components of long-term debt                    
Debt issuance cost         $ 1,200,000 $ 1,200,000        
Credit facility, maximum principal amount   $ 400,000,000.0                
Credit facility, additional borrowings available   $ 200,000,000.0                
Line of credit outstanding borrowings         0 0        
Letters of credit outstanding         0 0        
Credit facility, available capacity         354,300,000 354,300,000        
Debt instrument fixed charge coverage ratio   1                
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Revolving credit facility | Federal funds rate                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility   0.50%                
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Revolving credit facility | One-month LIBOR                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility   1.00%                
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Revolving credit facility | Minimum | LIBOR-based borrowings                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility   1.25%                
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Revolving credit facility | Minimum | Base rate borrowings                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility   0.25%                
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Revolving credit facility | Maximum | LIBOR-based borrowings                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility   1.50%                
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Revolving credit facility | Maximum | Base rate borrowings                    
Components of long-term debt                    
Applicable interest margin rate on the credit facility   0.50%                
Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028 | Redemption period one                    
Components of long-term debt                    
Debt redemption price percentage 105.125%                  
Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028 | Redemption period two                    
Components of long-term debt                    
Debt redemption price percentage 102.563%                  
Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028 | Redemption period three                    
Components of long-term debt                    
Debt redemption price percentage 101.708%                  
Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028 | Redemption period four                    
Components of long-term debt                    
Debt redemption price percentage 100.854%                  
Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028 | Redemption period five                    
Components of long-term debt                    
Debt redemption price percentage 100.00%                  
Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028 | Upon change of control                    
Components of long-term debt                    
Debt redemption price percentage 101.00%                  
Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028 | Senior notes                    
Components of long-term debt                    
Aggregate principal amount of debt $ 300,000,000.0       $ 300,000,000 $ 300,000,000   $ 0 $ 0  
Debt instrument interest rate stated, percentage 5.125%       5.125% 5.125% 5.125%      
Maturity date of senior subordinated notes           Feb. 01, 2028        
Debt issuance cost $ 4,800,000                  
Redemption percentage 35.00%                  
Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023                    
Components of long-term debt                    
Redemption percentage       35.00%            
Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023 | Redemption period one                    
Components of long-term debt                    
Debt redemption price percentage       106.125%            
Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023 | Redemption period two                    
Components of long-term debt                    
Debt redemption price percentage       104.594%            
Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023 | Redemption period three                    
Components of long-term debt                    
Debt redemption price percentage       103.063%            
Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023 | Redemption period four                    
Components of long-term debt                    
Debt redemption price percentage       101.531%            
Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023 | Redemption period five                    
Components of long-term debt                    
Debt redemption price percentage       100.00%            
Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023 | Upon change of control                    
Components of long-term debt                    
Debt redemption price percentage       101.00%            
Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023 | Senior notes                    
Components of long-term debt                    
Aggregate principal amount of debt       $ 400,000,000 $ 400,000,000 $ 400,000,000   $ 400,000,000 $ 400,000,000  
Debt instrument interest rate stated, percentage       6.125% 6.125% 6.125%        
Maturity date of senior subordinated notes           Nov. 01, 2023        
Debt issuance cost       $ 6,300,000            
Senior subordinated notes, interest at 8.25%, payable semi-annually, principal due march 2018 | Senior notes                    
Components of long-term debt                    
Aggregate principal amount of debt                   $ 400,000,000
Debt instrument interest rate stated, percentage                   8.25%
Maturity date of senior subordinated notes           Mar. 01, 2018        
Senior subordinated notes, interest at 8.25%, payable semi-annually, principal due march 2018 | Senior subordinated notes                    
Components of long-term debt                    
Debt redemption price percentage     102.063%