Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 30, 2024	Mar. 25, 2023	Sep. 30, 2023
Components of net periodic benefit costs included in operating expenses [Abstract]
Contribution to defined pension benefit plan	$ 2,000	$ 2,000
Estimated obligation due to full withdrawal multi employer pension plans	20,732		$ 21,398
Pension Plans Defined Benefit [Member]
Components of net periodic benefit costs included in operating expenses [Abstract]
Defined benefit plan expected future benefit payments	4,000
Pension Plans Defined Benefit [Member] | Other, Net [Member]
Components of net periodic benefit costs included in operating expenses [Abstract]
Contribution to defined pension benefit plan	2,000
Post-Retirement Benefits [Member]
Components of net periodic benefit costs included in operating expenses [Abstract]
Defined benefit plan expected future benefit payments	422
Post-Retirement Benefits [Member] | Other, Net [Member]
Components of net periodic benefit costs included in operating expenses [Abstract]
Employer contribution for postretirement health care and life insurance	$ 182