Leases - Lease Costs (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Jul. 05, 2020 USD ($)	Jul. 05, 2020 USD ($)
Finance Lease Costs [Abstract]
Amortization of ROU assets	$ 177	$ 590
Interest on lease liabilities	27	88
Operating lease cost	44,006	146,409
Short-term lease cost	46	149
Variable lease cost	9,494	31,317
Lease cost, total	$ 53,750	$ 178,553
Weighted-average remaining lease term (in years):
Finance leases	3 years 6 months	3 years 6 months
Operating leases	8 years 3 months 18 days	8 years 3 months 18 days
Weighted-average discount rate:
Finance leases	3.60%	3.60%
Operating leases	4.20%	4.20%
Variable lease cost, executory costs reimbursed by sub-lessees	$ 8,600	$ 28,800