Revenue and Accounts Receivable - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		36 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Nov. 30, 2023
Disaggregation of Revenue [Line Items]
Percent of customers excluded				89.00%
Reduction to bad debt expense	$ (14,391)	$ (12,797)		$ (23,015)	$ (19,547)
Recovery of uncollectible accounts, not yet been written off					$ 4,192
Mississippi Public Service Commission
Disaggregation of Revenue [Line Items]
Recovery of uncollectible accounts, term			2 years				1 year
Reduction to bad debt expense			$ 13,900
Recovery of uncollectible accounts, previously written off but not yet recovered through rates						$ 9,700
Recovery of uncollectible accounts, not yet been written off			$ 4,200
Pipeline and storage segment
Disaggregation of Revenue [Line Items]
Regulatory mechanism threshold				75.00%