Contingencies and Commitments (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 29, 2020	Sep. 30, 2020
Operating Leases [Abstract]
Rent expense	$ 3,200	$ 2,900
Acquisition Contingent Consideration [Abstract]
Contingent consideration	4,800			$ 5,500
Contingent consideration transaction final payout			$ 5,900
Loss on contingent consideration	$ 377	$ 0