Other Retirement Plans - Other Retirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 24, 2023	Sep. 25, 2022	Sep. 26, 2021
GCIU- Employer Retirement Fund
Multiemployer Plan [Line Items]
Contribution to multiemployer plan	$ 0	$ 0	$ 10
District No. 9, International Association of Machinists and Aerospace Workers Pension Trust
Multiemployer Plan [Line Items]
Contribution to multiemployer plan	0	0	15
CWA/ITU negotiated Pension Plan
Multiemployer Plan [Line Items]
Contribution to multiemployer plan	0	0	81
IAM National Pension Fund
Multiemployer Plan [Line Items]
Contribution to multiemployer plan	45	57	67
Operating Engineers Central Pension Fund of the International Union of Operating Engineers and Participating Employers
Multiemployer Plan [Line Items]
Contribution to multiemployer plan	$ 32	$ 50	$ 49