Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Leases [Abstract]
Term of option to extend	5 years		5 years
Termination option period			1 year
Weighted-average discount rate - operating leases	4.11%		4.11%
Weighted-average remaining lease term (years) - operating leases	5 years 1 month 20 days		5 years 1 month 20 days
Rental expense	$ 3.6		$ 7.3
Common area maintenance expense	$ 1.6	$ 1.4	$ 2.9	$ 2.7
Rental expense under previous guidance		$ 3.4		$ 6.9