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Unit-based Compensation - Summary of VAP Units outstanding and vested - Parenthetical (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Mar. 26, 2022 | Mar. 27, 2021 | Mar. 26, 2022 | Mar. 27, 2021 | Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019
Schedule of Share based Compensation Restricted Stock And Restricted Stock Units Activity [Line Items] |  |  |  |  |  |  |
Share based compensation by share based award equity instruments other than options unallocated share based compensation |  |  |  |  | $ 1.2 |  |
Share based compensation by share based award remaining period of recognition |  |  |  |  | 2 years |  |
Officers Employees And Directors [Member] | Value Appreciation Rights [Member] |  |  |  |  |  |  |
Schedule of Share based Compensation Restricted Stock And Restricted Stock Units Activity [Line Items] |  |  |  |  |  |  |
Allocated share based compensation | $ 0.9 | $ 0.1 | $ 1.1 | $ 0.1 | $ 11.6 | $ 0.1 | $ 0.0
Share based compensation by share based award equity instruments other than options unallocated share based compensation | $ 0.4 |  | $ 0.4 |  |  |  |
Share based compensation by share based award remaining period of recognition |  |  | 1 year 6 months |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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