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Aggregate number of common shares reserved for future issuance.

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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.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Stockholders' Equity, Equity-Based Compensation (Details) $ / shares in Units, $ in Millions			8 Months Ended	12 Months Ended
	Oct. 01, 2021 $ / shares shares	Feb. 07, 2021 shares	Sep. 30, 2020 $ / shares shares	Sep. 30, 2021 USD ($) Intallment $ / shares shares	Sep. 30, 2020 USD ($) Intallment $ / shares shares	Feb. 11, 2020 shares
Weighted Average Grant Date Fair Value [Abstract]
Compensation expense \| $				$ 5.7	$ 1.6
Class A Common Stock [Member]
Equity-Based Compensation [Abstract]
Total number of shares reserved for issuance (in shares)						1,509,565
Restricted Stock Units (RSUs) [Member]
Equity-Based Compensation [Abstract]
Awarded (in shares)			256,977	348,927
Number of Shares [Abstract]
Beginning balance (in shares)	545,094		44,666	301,643
Awarded (in shares)			256,977	348,927
Vested (in shares)			0	(105,476)
Forfeited (in shares)			0	0
Ending balance (in shares)			301,643	545,094	301,643
Weighted Average Grant Date Fair Value [Abstract]
Beginning balance (in dollars per share) \| $ / shares	$ 22.68		$ 14.61	$ 15.78
Awarded (in dollars per share) \| $ / shares			15.98	27.37
Vested (in dollars per share) \| $ / shares			0	18.47
Forfeited (in dollars per share) \| $ / shares			0	0
Ending balance (in dollars per share) \| $ / shares			$ 15.78	$ 22.68	$ 15.78
Unrecognized compensation expense \| $				$ 7.0
Weighted-average period of recognition				1 year 6 months
Performance Share Unit [Member]
Weighted Average Grant Date Fair Value [Abstract]
Compensation expense \| $				$ 2.6	$ 0.5
2021 Awards [Member] \| Time-Based Restricted Stock Units [Member]
Equity-Based Compensation [Abstract]
Number of equal annual installments for vesting \| Intallment				4
Awarded (in shares)	25,620			143,947
Number of Shares [Abstract]
Awarded (in shares)	25,620			143,947
2021 Awards [Member] \| Time-Based Restricted Stock Units [Member] \| Plan [Member]
Equity-Based Compensation [Abstract]
Awarded (in shares)	118,327
Number of Shares [Abstract]
Awarded (in shares)	118,327
2021 Awards [Member] \| Performance Share Unit [Member]
Equity-Based Compensation [Abstract]
Number of equal annual installments for vesting \| Intallment				3
Awarded (in shares)				102,490
Percentage of target award granted				100.00%
Number of shares of common stock consisted in each unit (in shares)				1
Percentage of expected performance targets to be achieved target award				200.00%
Number of Shares [Abstract]
Awarded (in shares)				102,490
2021 Awards [Member] \| Performance Share Unit [Member] \| Minimum [Member]
Equity-Based Compensation [Abstract]
Percentage of actual number of unit earned				0.00%
2021 Awards [Member] \| Performance Share Unit [Member] \| Maximum [Member]
Equity-Based Compensation [Abstract]
Percentage of actual number of unit earned				200.00%
2020 Awards [Member]
Equity-Based Compensation [Abstract]
Awarded (in shares)				44,666
Percentage of expected performance targets to be achieved target award				175.00%
Number of Shares [Abstract]
Awarded (in shares)				44,666
2020 Awards [Member] \| Restricted Stock Units (RSUs) [Member]
Equity-Based Compensation [Abstract]
Number of equal annual installments for vesting \| Intallment					4
Awarded (in shares)		39,727			100,000
Number of Shares [Abstract]
Awarded (in shares)		39,727			100,000
2020 Awards [Member] \| Restricted Stock Units (RSUs) [Member] \| Board of Directors [Member]
Equity-Based Compensation [Abstract]
Number of equal annual installments for vesting \| Intallment					4
Awarded (in shares)					139,727
Number of Shares [Abstract]
Awarded (in shares)					139,727
2020 Awards [Member] \| Performance Share Unit [Member]
Equity-Based Compensation [Abstract]
Number of equal annual installments for vesting \| Intallment				3
Awarded (in shares)				67,000
Percentage of target award granted				100.00%
Number of shares of common stock consisted in each unit (in shares)				1
Award vesting period				3 years
Number of Shares [Abstract]
Awarded (in shares)				67,000
2020 Awards [Member] \| Performance Share Unit [Member] \| Minimum [Member]
Equity-Based Compensation [Abstract]
Percentage of actual number of unit earned				0.00%
2020 Awards [Member] \| Performance Share Unit [Member] \| Maximum [Member]
Equity-Based Compensation [Abstract]
Percentage of actual number of unit earned				175.00%