Leases - Schedule of Quantitative Information on the Partnership's Lease Population (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Lessee Disclosure [Abstract]
Lease expense	$ 8,933	$ 7,262
Other information:
Cash payments for operating leases	8,941	7,410
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 12,387	$ 5,331
Weighted-average remaining lease term	6 years 4 months 24 days	6 years 8 months 12 days
Weighted-average discount rate	5.30%	5.20%