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Defined Benefit Pension Plans - Narrative (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 26, 2021 USD ($) plan | Sep. 25, 2022 USD ($) plan | Sep. 25, 2022 USD ($) plan | Sep. 26, 2021 USD ($) plan | Sep. 27, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of defined benefit plans | plan | 7 | 2 | 2 | 7 |
Defined benefit plans, number of plans frozen | plan | 2 |  | 4 |  |
Defined benefit plan, number of frozen plans merged | plan |  |  | 6 |  |
Number of fully-funded defined benefit plans | plan |  | 1 | 1 |  |
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Decrease to accumulated other comprehensive income due to plan enhancements |  |  | $ 6,077,000 |  |
Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Non-cash curtailment gain |  |  | 1,027,000 | $ 0 |
Increase to net pension liability due to plan enhancements |  |  | 6,077,000 | 0 |
Decrease in plan liabilities due to purchase of annuities |  | $ 85,622,000 |  |  |
Increase in defined benefit plan assets |  | 81,377,000 | $ 81,377,000 | $ 0 |
Settlement income charge |  | 4,245,000 |  |  |
Assumptions used calculating net periodic benefit cost, expected long-term rate of return on plan assets |  |  | 5.00% | 5.90% | 6.00%
Expected future employer contributions, next fiscal year |  | 0 | $ 0 |  |
Defined benefit plan accrued liability | $ 14,243,000 | 528,000 | 528,000 | $ 14,243,000 |
Pension Plan | U.S. Small Cap Value Equity Common/Collective Fund |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Investment in equity securities measured at fair value, recognized in net income | 7,236,000 | 2,235,000 | 2,235,000 | 7,236,000 |
Pension Plan | Global Equity Long/Short Common/Collective Hedge Fund-of-funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Investment in equity securities measured at fair value, recognized in net income | 8,371,000 | $ 16,663,000 | $ 16,663,000 | 8,371,000 |
Maximum percentage of equity investment redeemable |  | 0.90 | 0.90 |  |
Pension Plan | Global Equity Long/Short Common/Collective Hedge Fund-of-funds | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Notice for redemption of equity investment |  | 90 days | 90 days |  |
Pension Plan | Global Equity Long/Short Common/Collective Hedge Fund-of-funds | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Notice for redemption of equity investment |  | 120 days | 120 days |  |
Pension Plan | Global Equity Long/Short Common/Collective Hedge Fund-of-funds 2 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Investment in equity securities measured at fair value, recognized in net income | 10,387,000 | $ 15,852,000 | $ 15,852,000 | 10,387,000 |
Maximum percentage of equity investment redeemable |  | 0.50 | 0.50 |  |
Other Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan accrued liability | $ 996,000 | $ 967,000 | $ 967,000 | $ 996,000 |

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