Pension Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 27, 2026 |
Jun. 28, 2025 |
Jun. 27, 2026 |
Jun. 28, 2025 |
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| Defined Benefit Plan Disclosure [Line Items] | ||||
| Pension settlement charge | $ 0 | $ (450) | ||
| Pension Benefits [Member] | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Interest cost | $ 619 | $ 646 | 1,857 | 1,939 |
| Expected return on plan assets | (351) | (329) | (1,055) | (988) |
| Amortization of net loss (gain) | 58 | 61 | 172 | 184 |
| Pension settlement charge | 0 | 450 | 0 | 450 |
| Net periodic benefit cost | 326 | 828 | 974 | 1,585 |
| Postretirement Benefits [Member] | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Interest cost | 20 | 25 | 65 | 75 |
| Amortization of prior service credits | (6) | (6) | (17) | (19) |
| Amortization of net loss (gain) | (161) | (172) | (483) | (515) |
| Net periodic benefit cost | $ (147) | $ (153) | $ (435) | $ (459) |
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- 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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- 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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- 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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- 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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