Leases - Weighted Average Lease Terms and Discount Rates (Details)	Sep. 26, 2020	Sep. 28, 2019
Leases [Abstract]
Weighted-average remaining lease term - Operating leases	6 years 6 months 14 days	6 years 6 months 29 days
Weighted-average lease term - Finance leases	9 years 10 days	10 years 10 months 24 days
Weighted-average discount rate - Operating lease (percent)	3.80%	4.17%
Weighted-average discount rate - Finance lease (percent)	3.20%	3.50%