Leases - Schedule of Quantitative Information on the Partnership's Lease Population (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Lessee Disclosure [Abstract]
Lease expense	$ 9,578	$ 8,314	$ 27,870	$ 23,249
Other information:
Cash payments for operating leases	9,676	8,375	28,028	23,628
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 12,654	$ 6,616	$ 34,418	$ 28,061
Weighted-average remaining lease term	6 years 2 months 12 days	6 years 6 months	6 years 2 months 12 days	6 years 6 months
Weighted-average discount rate	5.20%	5.30%	5.20%	5.30%