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Stockholders' Deficit (Details) $ / shares in Units, $ in Millions									12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 21, 2020 $ / shares shares	May 11, 2020 shares	May 08, 2020 shares	Jan. 06, 2020 shares	Dec. 20, 2019 shares	Jun. 18, 2019 USD ($) $ / shares shares	Jun. 17, 2019 shares	Jan. 31, 2021 vote shares	Feb. 02, 2020 shares
Class of Stock [Line Items]
Offering costs | $	$ 0.6						$ 6.2
Common stock outstanding (in shares)								100
Common stock conversion ratio							1
IPO
Class of Stock [Line Items]
Sale of stock (in dollars per share) | $ / shares							$ 22.00
Net proceeds | $							$ 110.3
Equity Offering
Class of Stock [Line Items]
Sale of stock (in dollars per share) | $ / shares		$ 54.40
Net proceeds | $	$ 318.4
Over-Allotment Option
Class of Stock [Line Items]
Sale of stock (in dollars per share) | $ / shares		$ 54.40
Class A common stock
Class of Stock [Line Items]
Common stock outstanding (in shares)							53,475,000		97,708,518	66,445,422
Conversion of stock (in shares)					3,850,000	6,352,546	47,875,000
Common stock number of votes per share | vote									1
Class A common stock | Buddy Chester Sub LLC
Class of Stock [Line Items]
Conversion of stock (in shares)				17,584,098
Forward purchase agreement (in shares)			17,584,098
Class A common stock | IPO
Class of Stock [Line Items]
Sale of stock (in shares)							5,600,000
Class A common stock | Equity Offering
Class of Stock [Line Items]
Sale of stock (in shares)		5,100,000
Class A common stock | Over-Allotment Option
Class of Stock [Line Items]
Sale of stock (in shares)		765,000
Class B common stock
Class of Stock [Line Items]
Common stock outstanding (in shares)							345,125,000		317,338,356	334,922,454
Conversion of stock (in shares)					(3,850,000)	(6,352,546)	(47,875,000)	393,000,000
Common stock conversion ratio									1
Common stock number of votes per share | vote									10
Percentage of outstanding stock									7.50%
Class B common stock | Buddy Chester Sub LLC
Class of Stock [Line Items]
Conversion of stock (in shares)				(17,584,098)

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