Leases - Components of Operating Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Leases [Abstract]
Operating lease cost	$ 19,629
Variable lease cost	1,421
Short-term lease cost	459
Sublease income	126
Total lease cost	$ 21,383
Weighted average remaining lease term	7 years 9 months 18 days
Weighted average discount rate	4.90%
Operating cash outflows from operating leases	$ 19,391	$ 22,900	$ 22,100
ROU assets obtained in exchange for new operating lease liabilities	$ 10,884