Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Oct. 02, 2019	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Oct. 01, 2019
Class Of Stock [Line Items]
Capital stock, shares authorized					600,000,000
Preferred stock, shares authorized					40,000,000
Preferred stock, par value per share					$ 0.01
Common stock, shares authorized		560,000,000	560,000,000		560,000,000
Common stock, par value		$ 0.01	$ 0.01		$ 0.01
Common stock reserved for issuance	6,350,000
Increase in shares available for issuance, description	The shares available for issuance will automatically increase on January 1st of each year, by the lesser of (A) three percent (3%) of the number of shares of Common Stock outstanding as of the close of business on the immediately preceding December 31st; and (B) the number of shares of Common Stock determined by the Board on or prior to such date for such year.
Increase in shares available for issuance expressed as percentage of number of shares of common stock outstanding	3.00%
Stock-based compensation		$ 28,076	$ 60,555	$ 47,285
Due to the Resignation of Former CEO
Class Of Stock [Line Items]
Stock-based compensation		4,000
Due to the Resignation of Former CFO and General Counsel
Class Of Stock [Line Items]
Stock-based compensation		2,400
Net of Forfeitures, Due to the Resignation of Former CEO
Class Of Stock [Line Items]
Stock-based compensation		5,000
Net of Forfeitures, Due to the Resignation of Former CFO and General Counsel
Class Of Stock [Line Items]
Stock-based compensation		200
Restricted Stock Awards
Class Of Stock [Line Items]
Payroll taxes withheld related to vesting of awards		$ 49,000	$ 46,000	$ 9,400
Maximum | Restricted Stock Awards
Class Of Stock [Line Items]
Vesting period		4 years
Minimum | Restricted Stock Awards
Class Of Stock [Line Items]
Vesting period		2 years
2019 Equity Incentive Plan
Class Of Stock [Line Items]
Common stock reserved for issuance	5,300,000
Share-based compensation arrangement by share-based payment award, terms of award		Awards issued under the Plan may not have a term greater than ten years from the date of grant.
2019 Equity Incentive Plan | Maximum
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, expected term		10 years
2019 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Common stock reserved for issuance	1,050,000
Shares approved for issuance under plan	1,050,000
Plan offering description	At the end of each designated offering period, which occurs every six months on February 15 and August 15, employees can elect to purchase shares of our common stock with contributions of up to 12% of their base pay, accumulated via payroll deductions, at an amount equal to 85% of the lower of our stock price on (i) the first day of the offering period, or (ii) the last day of the offering period.
Employee contributions to purchase Shares, percent of base pay accumulated	12.00%
Percentage of stock price under plan	85.00%