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Unit-based Compensation - Summary of VAP Units Outstanding and Vested (Detail) - Officers Employees And Directors [Member] - Value Appreciation Rights [Member] - shares	3 Months Ended	12 Months Ended
	Mar. 26, 2022	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Schedule of Share based Compensation Restricted Stock And Restricted Stock Units Activity [Line Items]
Balance at beginning of period	4,039,620	4,389,257	5,053,182	7,574,464
Granted	0	0	0	0
Exercised	(255,845)
Forfeited	(92,664)	(349,637)	(663,925)	(2,521,282)
Balance at end of period	3,691,111	4,039,620	4,389,257	5,053,182
Vested at September 25, 2021	3,554,588	3,672,430
Vested and exercisable at September 25, 2021	2,369,725	2,448,287

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Schedule of sharebased compensation restricted stock and restricted stock units activity [Line items].

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Share based compensation by share based award equity instruments other than options cumulatively vested.

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share based compensation by share based award equity instruments other than options vested and excercisable.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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)
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Publisher FASB
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Number of non-option equity instruments exercised by participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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