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Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 28, 2020 | Mar. 30, 2019 | Sep. 28, 2019
Components of net periodic benefit costs included in operating expenses [Abstract] |  |  |
Contribution to defined pension benefit plan | $ 2,030 | $ 3,320 |
Estimated obligation due to full withdrawal multi employer pension plans | 20,910 |  | $ 21,441
Defined Benefit Pension Plan [Member] |  |  |
Components of net periodic benefit costs included in operating expenses [Abstract] |  |  |
Defined benefit plan expected future benefit payments | 3,800 |  |
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 | 2,030 |  |
Post-Retirement Benefits [Member] |  |  |
Components of net periodic benefit costs included in operating expenses [Abstract] |  |  |
Defined benefit plan expected future benefit payments | 970 |  |
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 | $ 444 |  |

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- Definition Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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- Definition Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 + Details
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