Financial Instruments and Risk Management - Fair Value of the Partnership's Senior Notes (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Sep. 26, 2020
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	$ 1,033,875	$ 1,147,251
5.5% Senior Notes due June 1, 2024 [Member]
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	0	531,563
5.75% Senior Notes due March 1, 2025 [Member]
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	0	255,625
5.875% Senior Notes due March 1, 2027 [Member]
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	369,250	360,063
5.0 % Senior Notes due June 1, 2031 [Member]
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	$ 664,625	$ 0