Revenue and Accounts Receivable - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended			9 Months Ended		27 Months Ended
	Nov. 30, 2023	Dec. 31, 2023	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Percent of customers excluded			88.00%			88.00%
Reduction to bad debt expense			$ (3,575)		$ (1,758)	$ (23,122)	$ (22,000)
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	1 year	2 years		2 years
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
Distribution segment
Disaggregation of Revenue [Line Items]
Regulatory mechanism threshold						75.00%
Pipeline and storage segment
Disaggregation of Revenue [Line Items]
Rate case revenue benchmark	$ 69,400	$ 106,900