Pension and Other Postretirement Benefit Plans - Schedule of Components of Net Periodic Pension Benefit Expense Recognized in Earnings (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 27, 2026 |
Mar. 28, 2025 |
Mar. 27, 2026 |
Mar. 28, 2025 |
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| Component: | ||||
| Service cost | $ 2,831 | $ 2,496 | $ 5,668 | $ 4,995 |
| Interest cost | 21,932 | 20,684 | 43,812 | 41,086 |
| Expected return on plan assets | (27,594) | (25,041) | (55,117) | (49,728) |
| Amortization of previously unrecognized items | 3,388 | 3,045 | 6,768 | 6,047 |
| Settlement | 1,398 | 0 | 1,398 | 0 |
| Total net periodic pension benefit expense recognized | $ 1,955 | $ 1,184 | $ 2,529 | $ 2,400 |
| X | ||||||||||
- Definition Defined Benefit Plan, Amortization Of Gain (Loss) And Prior Service Cost (Credit) No definition available.
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| X | ||||||||||
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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