Financial Instruments and Risk Management - Fair Value of the Partnership's Senior Notes (Details) - USD ($) $ in Thousands	Mar. 26, 2022	Sep. 25, 2021
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	$ 966,375	$ 1,043,063
5.875% Senior Notes due March 1, 2027 [Member]
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	357,000	367,063
5.0 % Senior Notes due June 1, 2031 [Member]
Bank Debt and Senior Notes [Abstract]
Fair value of Senior Notes	$ 609,375	$ 676,000

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

No definition available.

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant