Leases - Schedule of Quantitative Information on the Partnership's Lease Population (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Lessee Disclosure [Abstract]
Lease expense	$ 9,358	$ 7,673	$ 18,292	$ 14,935
Other information:
Cash payments for operating leases	9,412	7,843	18,353	15,253
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 9,377	$ 16,114	$ 21,764	$ 21,445
Weighted-average remaining lease term	6 years 3 months 18 days	6 years 7 months 6 days	6 years 3 months 18 days	6 years 7 months 6 days
Weighted-average discount rate	5.30%	5.10%	5.30%	5.10%