Stockholder's Equity - Additional Information (Details) - $ / shares	9 Months Ended
	Jun. 30, 2021	Jan. 01, 2021	Sep. 30, 2020	Oct. 02, 2019	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 per share	$ 0.01		$ 0.01		$ 0.01
Common stock reserved for issuance		1,130,547		6,350,000
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