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Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 27, 2021 | Mar. 28, 2020 | Mar. 27, 2021 | Mar. 28, 2020 | Sep. 26, 2020
Components of net periodic benefit costs included in operating expenses [Abstract] |  |  |  |  |
Contribution to defined pension benefit plan |  |  | $ 3,690 | $ 2,030 |
Estimated obligation due to full withdrawal multi employer pension plans | $ 19,876 |  | 19,876 |  | $ 20,396
Pension settlement charge |  |  | 570 | 0 |
Defined Benefit Pension Plan [Member] |  |  |  |  |
Components of net periodic benefit costs included in operating expenses [Abstract] |  |  |  |  |
Defined benefit plan expected future benefit payments | 6,250 |  | 6,250 |  |
Settlement threshold amount |  |  | 2,135 |  |
Pension settlement charge | 570 | $ 0 | 570 | $ 0 |
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 |  |  | 3,690 |  |
Post-Retirement Benefits [Member] |  |  |  |  |
Components of net periodic benefit costs included in operating expenses [Abstract] |  |  |  |  |
Defined benefit plan expected future benefit payments | $ 843 |  | 843 |  |
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 |  |  | $ 374 |  |

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