Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 26, 2022	Mar. 27, 2021	Mar. 26, 2022	Mar. 27, 2021	Sep. 25, 2021
Components of net periodic benefit costs included in operating expenses [Abstract]
Contribution to defined pension benefit plan			$ 1,110	$ 3,690
Pension settlement charge			0	570
Estimated obligation due to full withdrawal multi employer pension plans	$ 23,035		23,035		$ 23,567
Defined Benefit Pension Plan [Member]
Components of net periodic benefit costs included in operating expenses [Abstract]
Defined benefit plan expected future benefit payments	3,330		3,330
Settlement threshold amount		$ 2,135
Pension settlement charge	0	$ 570	0	$ 570
Defined Benefit Pension Plan [Member] | Other, Net [Member]
Components of net periodic benefit costs included in operating expenses [Abstract]
Contribution to defined pension benefit plan			1,110
Post-Retirement Benefits [Member]
Components of net periodic benefit costs included in operating expenses [Abstract]
Defined benefit plan expected future benefit payments	$ 710		710
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			$ 332