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Unit-based Compensation - Summary of Class C Units Outstanding and Vested (Parenthetical) (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 26, 2022 | Mar. 27, 2021 | Sep. 25, 2021 | Sep. 26, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Share based compensation by share based award remaining period of recognition |  |  | 2 years |
Officers Employees And Directors [Member] | Redeemable Class C Units [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Allocated share based compensation | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1
Share based compensation by share based award options unrecognized compensation | $ 0.3 |  | $ 0.4 |
Share based compensation by share based award remaining period of recognition | 3 years 9 months 18 days |  | 4 years 6 months |
Share based compensation by share based award lock in period |  |  | 6 months | 6 months

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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