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Investments in and Acquisitions and Dispositions of Businesses Additional Information (Details) $ in Thousands			3 Months Ended	12 Months Ended
	Dec. 28, 2022 USD ($) Cattle	Feb. 17, 2022 USD ($)	Mar. 26, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 24, 2022 USD ($)	Sep. 25, 2021 USD ($)
Business Acquisition [Line Items]
Cash paid to acquire business				$ 130,124	$ 56,083	$ 8,716
Weighted average useful lives				12 years
Goodwill, Purchase Accounting Adjustments				$ 500
Business Combination, Acquisition Related Costs				4,695
Proceeds from sale of business				$ 0	$ 850	$ 0
Customer Relationships [Member] \| Sph All Other [Member]
Business Acquisition [Line Items]
Fair value of intangible assets	$ 42,924
Favorable Supply Contracts [Member] \| Sph All Other [Member]
Business Acquisition [Line Items]
Fair value of intangible assets	5,100
Propane and Propane Retailer [Member]
Business Acquisition [Line Items]
Proceeds from sale of business		$ 850
Gain on sale of assets			$ 363
Oberon
Business Acquisition [Line Items]
Percentage of equity interest				38.00%
Independence Hydrogen, Inc.
Business Acquisition [Line Items]
Percentage of equity interest				25.00%
RNG assets
Business Acquisition [Line Items]
Cash paid to acquire business	$ 190,000
Number Of Dairy Cattle \| Cattle	55,000
Creation of a joint venture	$ 155,000
Percentage of equity interest	70.00%
RNG Projects
Business Acquisition [Line Items]
Maximum earnout potential capped amount	$ 45,000
Suburban Renewable Energy
Business Acquisition [Line Items]
Non-controlling interest	30.00%