Financial Instruments and Risk Management - Fair Value of the Partnership's Senior Notes (Details) - USD ($) $ in Thousands	Mar. 30, 2024	Sep. 30, 2023
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	$ 1,003,971	$ 938,939
5.875% Senior Notes due March 1, 2027 [Member]
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	346,812	334,250
5.00% Senior Notes due June 1, 2031 [Member]
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	592,501	541,658
5.50% Green Bonds Due October 1, 2028 through October 1, 2033 [Member]
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	$ 64,658	$ 63,031