Assets and Liabilities Held for Sale and Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Loss on write-down to fair value less cost to sell						$ 8,000
Cash and cash equivalents						114
Accounts receivable, net						21,204
Inventories						20,715
Prepaid expenses and other current assets						5,098
Property, plant and equipment, net						53,111
Goodwill						17,051
Intangible assets, net						39,275
Investments in unconsolidated entities						18,272
Operating lease right-of-use assets						3,962
Other noncurrent assets						4,379
Valuation allowance on assets held for sale						(7,974)
Total assets held for sale		$ 0		$ 0		175,207
Accounts payable						32,072
Accrued expenses and other payables						4,650
Advance payments received from customers						259
Operating lease obligations-current						1,705
Operating lease obligations-noncurrent						2,233
Other noncurrent liabilities						1,184
Total liabilities held for sale		0		0		42,103
Revenues (1)		(12)	$ 596,203	148,074	$ 1,224,228
Cost of sales (1)		(77)	598,280	146,520	1,232,183
Operating expenses		39	1,567	501	2,712
General and administrative expenses (1)		(22)	62	(6)	112
Depreciation and amortization		0	56	0	111
Loss (gain) on disposal or impairment of assets, net	$ (38,400)	3	0	(38,370)	0
Operating income (loss) from discontinued operations		45	(3,762)	39,429	(10,890)
Interest expense		0	(224)	(5)	(224)
Other expense, net		(20)	(12)	(20)	(9)
Income (loss) from discontinued operations before taxes		25	(3,998)	39,404	(11,123)
Income tax expense		(16)	(104)	(16)	(107)
Income (loss) from discontinued operations, net of tax		9	$ (4,102)	39,388	$ (11,230)
Discontinued Operations, Disposed of by Means Other than Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Total assets held for sale		146		146		67,432
Total liabilities held for sale		40		40		52,749
Crude Oil Logistics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Cash and cash equivalents						0
Accounts receivable, net						0
Inventories						0
Prepaid expenses and other current assets						0
Property, plant and equipment, net						1,350
Goodwill						0
Intangible assets, net						0
Investments in unconsolidated entities						0
Operating lease right-of-use assets						0
Other noncurrent assets						1,237
Valuation allowance on assets held for sale						0
Total assets held for sale						2,587
Accounts payable						0
Accrued expenses and other payables						0
Advance payments received from customers						0
Operating lease obligations-current						0
Operating lease obligations-noncurrent						0
Other noncurrent liabilities						0
Total liabilities held for sale						0
Water Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Cash and cash equivalents						0
Accounts receivable, net						0
Inventories						0
Prepaid expenses and other current assets						0
Property, plant and equipment, net						412
Goodwill						0
Intangible assets, net						29,557
Investments in unconsolidated entities						18,221
Operating lease right-of-use assets						0
Other noncurrent assets						0
Valuation allowance on assets held for sale						(7,974)
Total assets held for sale						40,216
Accounts payable						0
Accrued expenses and other payables						0
Advance payments received from customers						0
Operating lease obligations-current						0
Operating lease obligations-noncurrent						0
Other noncurrent liabilities						94
Total liabilities held for sale						94
Liquids Logistics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Cash and cash equivalents						114
Accounts receivable, net						21,204
Inventories						20,715
Prepaid expenses and other current assets						5,098
Property, plant and equipment, net						51,349
Goodwill						17,051
Intangible assets, net						9,718
Investments in unconsolidated entities						51
Operating lease right-of-use assets						3,962
Other noncurrent assets						3,142
Valuation allowance on assets held for sale						0
Total assets held for sale						132,404
Accounts payable						32,072
Accrued expenses and other payables						4,650
Advance payments received from customers						259
Operating lease obligations-current						1,705
Operating lease obligations-noncurrent						2,233
Other noncurrent liabilities						1,090
Total liabilities held for sale						42,009
Liquids Logistics | Discontinued Operations, Disposed of by Means Other than Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Accounts receivable, net		0		0		67,350
Prepaid expenses and other current assets		146		146		82
Total assets held for sale		146		146		67,432
Accounts payable		40		40		48,454
Accrued expenses and other payables		0		0		4,295
Total liabilities held for sale		$ 40		$ 40		$ 52,749