Marketable Securities - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Dec. 31, 2020	Mar. 31, 2021	Mar. 28, 2020
Marketable Securities [Abstract]
Marketable securities held		$ 0
Proceeds from sale of marketable securities	$ 56,200,000	$ 56,170,000	$ 0