Long-Term Debt - Components of Long-term Debt (Details) - USD ($)	3 Months Ended
	Dec. 30, 2017	Dec. 14, 2017	Sep. 30, 2017	Dec. 24, 2016	Nov. 09, 2015
Debt Instrument [Line Items]
Total	$ 691,336,000		$ 395,653,000	$ 395,408,000
Less current portion	(372,000)		(375,000)	(397,000)
Long-term portion	690,964,000		395,278,000	395,011,000
Senior notes
Debt Instrument [Line Items]
Unamortized debt issuance costs	(9,161,000)		(4,840,000)	(5,436,000)
Total	690,839,000		395,160,000	394,564,000
Senior notes | Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023
Debt Instrument [Line Items]
Notes	$ 400,000,000		400,000,000	400,000,000	$ 400,000,000
Debt instrument maturity period	Nov. 01, 2023
Debt instrument interest rate stated, percentage	6.125%				6.125%
Senior notes | Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028
Debt Instrument [Line Items]
Notes	$ 300,000,000	$ 300,000,000.0	0	0
Total	$ 295,500,000
Debt instrument interest rate stated, percentage	5.125%	5.125%
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
Debt Instrument [Line Items]
Total	$ 0		0	0
Debt instrument maturity period	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 | Base rate borrowings
Debt Instrument [Line Items]
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 | LIBOR-based borrowings
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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 | Minimum | LIBOR-based borrowings
Debt Instrument [Line Items]
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 | Maximum | Base rate borrowings
Debt Instrument [Line Items]
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 | Maximum | LIBOR-based borrowings
Debt Instrument [Line Items]
Applicable interest margin rate on the credit facility	1.50%
Other notes payable
Debt Instrument [Line Items]
Total	$ 497,000		$ 493,000	$ 844,000
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.75% or Base Rate plus a margin of 0.25% to 0.75%, final maturity December 2018 | Minimum | Base rate borrowings
Debt Instrument [Line Items]
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 1.75% or Base Rate plus a margin of 0.25% to 0.75%, final maturity December 2018 | Minimum | LIBOR-based borrowings
Debt Instrument [Line Items]
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 1.75% or Base Rate plus a margin of 0.25% to 0.75%, final maturity December 2018 | Maximum | Base rate borrowings
Debt Instrument [Line Items]
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 1.75% or Base Rate plus a margin of 0.25% to 0.75%, final maturity December 2018 | Maximum | LIBOR-based borrowings
Debt Instrument [Line Items]
Applicable interest margin rate on the credit facility	1.75%