Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 28, 2026	Sep. 27, 2025	Mar. 29, 2025	Apr. 30, 2021	Oct. 31, 2020	Dec. 31, 2017
Components of long-term debt
Total	$ 1,192,600	$ 1,191,703	$ 1,190,846
Less current portion	(55)	(62)	(122)
Long-term portion	1,192,545	1,191,641	1,190,724
Senior Notes
Components of long-term debt
Unamortized debt issuance costs	(7,524)	(8,458)	(9,402)
Total	$ 1,192,476	1,191,542	1,190,598
Senior Notes | Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028
Components of long-term debt
Interest rate	5.125%					5.125%
Gross carrying value	$ 300,000	300,000	300,000
Total	$ 299,200	298,900	298,700
Senior Notes | Senior notes, interest at 4.125%, payable semi-annually, principal due October 2030
Components of long-term debt
Interest rate	4.125%				4.125%
Gross carrying value	$ 500,000	500,000	500,000
Total	$ 496,400	496,000	495,600
Senior Notes | Senior notes, interest at 4.125%, payable semi-annually, principal due April 2031
Components of long-term debt
Interest rate	4.125%			4.125%
Gross carrying value	$ 400,000	400,000	400,000
Total	397,000	396,700	396,300
Secured Debt | Asset-based Revolving Credit Facility One
Components of long-term debt
Total	$ 0	0	0
Secured Debt | Asset-based Revolving Credit Facility One | Minimum | Secured Overnight Financing Rate
Components of long-term debt
Interest rate margin	1.00%
Secured Debt | Asset-based Revolving Credit Facility One | Minimum | Base Rate
Components of long-term debt
Interest rate margin	0.00%
Secured Debt | Asset-based Revolving Credit Facility One | Maximum | Secured Overnight Financing Rate
Components of long-term debt
Interest rate margin	1.50%
Secured Debt | Asset-based Revolving Credit Facility One | Maximum | Base Rate
Components of long-term debt
Interest rate margin	0.50%
Other Notes Payable
Components of long-term debt
Total	$ 124	$ 161	$ 248