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Intangible Assets (Tables)
 12 Months Ended
Mar. 31, 2024
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Schedule of finite-lived intangible assets
Our intangible assets consist of the following at the dates indicated:
March 31, 2024March 31, 2023
DescriptionWeighted-
Average
Remaining
Useful Life		Gross Carrying
Amount		Accumulated
Amortization		NetGross Carrying
Amount		Accumulated
Amortization		Net
(in years)(in thousands)
Amortizable:
Customer relationships18.6$905,113 $(265,621)$639,492 $1,196,468 $(492,002)$704,466 
Customer commitments20.3192,000 (36,480)155,520 192,000 (28,800)163,200 
Rights-of-way and easements29.995,231 (18,187)77,044 94,875 (15,138)79,737 
Water rights25.636,068 (5,310)30,758 99,869 (26,453)73,416 
Debt issuance costs (1)4.918,473 (605)17,868 25,592 (9,921)15,671 
Executory contracts and other agreements25.217,854 (3,670)14,184 21,570 (5,037)16,533 
Pipeline capacity rights19.77,799 (2,687)5,112 7,799 (2,427)5,372 
Non-compete agreements— — — — 1,100 (1,082)18 
Total amortizable1,272,538 (332,560)939,978 1,639,273 (580,860)1,058,413 
Non-amortizable:
Trade names— — 255 255 
Total$1,272,538 $(332,560)$939,978 $1,639,528 $(580,860)$1,058,668 
(1)    Includes debt issuance costs related to the ABL Facility. Debt issuance costs related to the fixed-rate notes and Term Loan B are reported as a reduction of the carrying amount of long-term debt.

Amounts in the table above do not include intangible assets and accumulated amortization related to the sale of certain freshwater water solutions facilities and certain saltwater disposal assets, as these amounts have been classified as assets held for sale within our March 31, 2024 consolidated balance sheet (see Note 17).
Schedule of indefinite-lived intangible assets
Our intangible assets consist of the following at the dates indicated:
March 31, 2024March 31, 2023
DescriptionWeighted-
Average
Remaining
Useful Life		Gross Carrying
Amount		Accumulated
Amortization		NetGross Carrying
Amount		Accumulated
Amortization		Net
(in years)(in thousands)
Amortizable:
Customer relationships18.6$905,113 $(265,621)$639,492 $1,196,468 $(492,002)$704,466 
Customer commitments20.3192,000 (36,480)155,520 192,000 (28,800)163,200 
Rights-of-way and easements29.995,231 (18,187)77,044 94,875 (15,138)79,737 
Water rights25.636,068 (5,310)30,758 99,869 (26,453)73,416 
Debt issuance costs (1)4.918,473 (605)17,868 25,592 (9,921)15,671 
Executory contracts and other agreements25.217,854 (3,670)14,184 21,570 (5,037)16,533 
Pipeline capacity rights19.77,799 (2,687)5,112 7,799 (2,427)5,372 
Non-compete agreements— — — — 1,100 (1,082)18 
Total amortizable1,272,538 (332,560)939,978 1,639,273 (580,860)1,058,413 
Non-amortizable:
Trade names— — 255 255 
Total$1,272,538 $(332,560)$939,978 $1,639,528 $(580,860)$1,058,668 
(1)    Includes debt issuance costs related to the ABL Facility. Debt issuance costs related to the fixed-rate notes and Term Loan B are reported as a reduction of the carrying amount of long-term debt.

Amounts in the table above do not include intangible assets and accumulated amortization related to the sale of certain freshwater water solutions facilities and certain saltwater disposal assets, as these amounts have been classified as assets held for sale within our March 31, 2024 consolidated balance sheet (see Note 17).
Schedule of amortization expense
Amortization expense is as follows for the periods indicated:
Year Ended March 31,
Recorded In202420232022
(in thousands)
Depreciation and amortization$67,981 $77,492 $84,937 
Cost of sales260 274 281 
Interest expense 5,541 4,866 4,779 
Operating expenses247 247 247 
Total$74,029 $82,879 $90,244 
Schedule of expected amortization of intangible assets
The following table summarizes expected amortization of our intangible assets at March 31, 2024 (in thousands):
Year Ending March 31, 
2025$59,403 
202658,145 
202757,464 
202854,575 
202952,001 
Thereafter658,390 
Total$939,978