Leases - Sale, Leaseback Transactions (Details) $ in Thousands	3 Months Ended	4 Months Ended	12 Months Ended
	Jul. 05, 2020 USD ($)	Jan. 19, 2020 USD ($)	Sep. 27, 2020 USD ($) sale_leasebackTransaction	Sep. 29, 2019 USD ($)	Sep. 30, 2018 USD ($)
Sale Leaseback Transaction [Line Items]
Number of sales - leaseback transactions completed | sale_leasebackTransaction			2
Proceeds from the sale and leaseback of assets			$ 19,828	$ 4,447	$ 9,336
Notice period for termination of lease without penalty			90 days
Multi-tenant Commercial Property
Sale Leaseback Transaction [Line Items]
Proceeds from the sale and leaseback of assets		$ 17,400
Gain (loss) on sale and leaseback transaction		$ (200)
Initial term of operating lease		20 years
Restaurant
Sale Leaseback Transaction [Line Items]
Proceeds from the sale and leaseback of assets	$ 2,400
Gain (loss) on sale and leaseback transaction	$ (100)
Initial term of operating lease	17 years
Principal Executive Offices
Sale Leaseback Transaction [Line Items]
Proceeds from the sale and leaseback of assets			$ 20,600
Gain (loss) on sale and leaseback transaction			$ 10,800
Initial term of operating lease			18 months