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Unit-based Compensation - Summary of The Fair Value of Each Class C Unit Grant Using A Black-Scholes Option (Detail) - Officers Employees And Directors [Member] - Redeemable Class C Units [Member] - Share-based Payment Arrangement, Option [Member]	3 Months Ended	12 Months Ended
	Mar. 26, 2022	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Schedule of Share Based Payment Award Valuation Assumptions Line Items [Line Items]
Dividend yield	0.00%	0.00%	0.00%	0.00%
Volatility	45.00%	40.00%	50.00%	40.00%
Risk-free interest rate	2.30%	0.29%	0.12%	1.58%
Expected term (years)	2 years	2 years	1 year 3 months	3 years

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- Definition

Schedule of share based payment award valuation assumptions [Line items].

+ References

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ 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 (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ 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 (f)(2)(ii)
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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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-Publisher FASB
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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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