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Unit-based Compensation (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 26, 2022 | Sep. 25, 2021
Share-based Payment Arrangement [Abstract] |  |
Summary of Class C Units outstanding and vested | The following is a summary of Class C Units outstanding and vested:
|  | Class C Units |
Balance at September 25, 2021 |  |  | 428,571 |
Granted |  |  | 8,468 |
Redeemed |  |  | — |
Forfeited |  |  | (8,468 | )
Balance at March 26, 2022 |  |  | 428,571 |
Vested at March 26, 2022 |  |  | 359,569 |
| The following is a summary of Class C Units outstanding and vested:
|  | Class C Units |
Balance at September 29, 2018 |  |  | 428,571 |
Granted |  |  | 64,987 |
Redeemed |  |  | — |
Forfeited |  |  | (64,987 | )
Balance at September 28, 2019 |  |  | 428,571 |
Granted |  |  | 42,587 |
Redeemed |  |  | — |
Forfeited |  |  | (42,587 | )
Balance at September 26, 2020 |  |  | 428,571 |
Granted |  |  | 51,543 |
Redeemed |  |  | — |
Forfeited |  |  | (51,543 | )
Balance at September 25, 2021 |  |  | 428,571 |
Vested at September 25, 2021 |  |  | 340,282 |
Summary of the fair value of each Class C Unit grant using a Black-Scholes option | The fair value of each Class C Unit granted during the three months ended March 26, 2022 and year ended September 25, 2021 was estimated on the date of the award using a combination of the market approach and income approach, which utilizes a Black-Scholes option pricing model with the following assumptions:
|  | March 26, 2022 |  |  | September 25, 2021 |
Dividend yield |  |  | — | % |  |  | — | %
Volatility (a) |  |  | 45.00 | % |  |  | 40.00 | %
Risk-free interest rate (b) |  |  | 2.30 | % |  |  | 0.29 | %
Expected term (years) (c) |  |  | 2.00 |  |  |  | 2.00 |
(a) | The expected volatility is estimated based on the historical volatility of a select peer group of similar publicly traded companies for a term that is consistent with the expected term of the Class C Units.
(b) | The risk-free interest rate is based on the U.S. Treasury constant maturity interest rate whose term is consistent with the expected term of the Class C Units.
(c) | The expected term is based on estimated liquidity event timing, which is based on a combination of scenarios with one being based on the probability of an initial public offering and the other based on the expected timing of a potential exit event under a remain private scenario.
| The fair value of each Class C Unit grant was estimated on the date of the award using a Black-Scholes option pricing model with the following assumptions:
|  | Year Ended |
|  | September 25, 2021 |  |  | September 26, 2020 |  |  | September 28, 2019 |
Dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Volatility (a) |  |  | 40.0 | % |  |  | 50.0 | % |  |  | 40.0 | %
Risk-free interest rate (b) |  |  | 0.29 | % |  |  | 0.12 | % |  |  | 1.58 | %
Expected term (years) (c) |  |  | 2.00 |  |  |  | 1.25 |  |  |  | 3.00 |
(a) | The expected volatility is estimated based on the historical volatility of a select peer group of similar publicly traded companies for a term that is consistent with the expected term of the Class C Units.
(b) | The risk-free interest rate is based on the U.S. Treasury constant maturity interest rate whose term is consistent with the expected term of the Class C Units.
(c) | The expected term is based on estimated liquidity event timing as further described above.
Summary of VAP Units outstanding and vested: | The following is a summary of Value Appreciation Units (“VAP Units”) outstanding and vested:
|  | VAP Units |
Balance at September 25, 2021 |  |  | 4,039,620 |
Granted |  |  | — |
Exercised |  |  | (255,845 | )
Forfeited |  |  | (92,664 | )
Balance at March 26, 2022 |  |  | 3,691,111 |
Vested at March 26, 2022 |  |  | 3,554,588 |
Vested and exercisable at March 26, 2022 |  |  | 2,369,725 |
| The following is a summary of VAP Units outstanding and vested:
|  | VAP Units |
Balance at September 29, 2018 |  |  | 7,574,464 |
Granted |  |  | — |
Exercised |  |  | — |
Forfeited |  |  | (2,521,282 | )
Balance at September 28, 2019 |  |  | 5,053,182 |
Granted |  |  | — |
Exercised |  |  | — |
Forfeited |  |  | (663,925 | )
Balance at September 26, 2020 |  |  | 4,389,257 |
Granted |  |  | — |
Exercised |  |  | — |
Forfeited |  |  | (349,637 | )
Balance at September 25, 2021 |  |  | 4,039,620 |
Vested at September 25, 2021 |  |  | 3,672,430 |
Vested and exercisable at September 25, 2021 |  |  | 2,448,287 |
Schedule of share based payment award warrant units valuation assumptions | The assumptions made for purposes of estimating fair value under the Black-Scholes pricing model for the Warrants were as follows:​​​​​​​
|  | Selected Assumption |
Dividend yield |  |  | 0 | %
Volatility (a) |  |  | 43.00 | %
Risk-free interest rate (b) |  |  | 1.65 | %
Expected term (years) (c) |  |  | 10.00 |
(a) | The expected volatility is estimated based on the historical volatility of a select peer group of similar publicly traded companies for a term that is consistent with the expected term of the Warrants.
(b) | The risk-free interest rate is based on the U.S. Treasury constant maturity interest rate whose term is consistent with the expected term of the Warrants.
(c) | The expected term is based on the contractual term of the Warrants.
| The assumptions made for purposes of estimating fair value under the Black-Scholes pricing model for the Warrants were as follows:​​​​​​​
|  | Selected Assumption |
Dividend yield |  |  | 0 | %
Volatility (a) |  |  | 43.0 | %
Risk-free interest rate (b) |  |  | 1.65 | %
Expected term (years) (c) |  |  | 10.00 |
(a) | The expected volatility is estimated based on the historical volatility of a select peer group of similar publicly traded companies for a term that is consistent with the expected term of the Warrants.
(b) | The risk-free interest rate is based on the U.S. Treasury constant maturity interest rate whose term is consistent with the expected term of the Warrants.
(c) | The expected term is based on the contractual term of the Warrants.
Schedule of stock warrant activity |  | The following table summarizes stock warrant activity for the year ended September 25, 2021:
|  | Warrant Units |
Outstanding and nonvested at September 26, 2020 |  |  | — |
Granted |  |  | 714,022 |
Vested |  |  | (446,741 | )
Outstanding and nonvested at September 25, 2021 |  |  | 267,281 |

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- Definition Tabular disclosure of share-based payment arrangement. + 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 -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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + 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 (a) -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 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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