Leases - Additional Lease Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Jun. 27, 2020	Jun. 27, 2020
Leases [Abstract]
Operating lease cost	$ 6,900	$ 20,800
Finance lease cost - amortization of right-of-use assets	0	300
Finance lease cost - interest cost	300	800
Operating cash flows from finance leases	300	800
Operating cash flows from operating leases	6,100	17,800
Financing cash flows from finance leases	400	1,300
Total cash paid for amounts included in the measurement of lease liabilities	6,800	19,900
ROU assets arising from entering into new operating lease obligations	$ 6,000.0	$ 10,700