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Unit-based Compensation - Summary of Class C Units Outstanding and Vested (Detail) - Officers Employees And Directors [Member] - Share-based Payment Arrangement, Option [Member] - Redeemable Class C Units [Member] - shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 26, 2022 | Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Balance at beginning of period | 428,571 | 428,571 | 428,571 | 428,571
Granted | 8,468 | 51,543 | 42,587 | 64,987
Redeemed | 0 | 0 | 0 | 0
Forfeited | (8,468) | (51,543) | (42,587) | (64,987)
Balance at end of period | 428,571 | 428,571 | 428,571 | 428,571
Vested at September 25, 2021 | 359,569 | 340,282 |  |

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- Definition Share based compensation arrangement by share based award options redeemed during the year. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Details
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