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Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Mar. 31, 2025
Amortization related to intangible assets    
Finite-lived intangible assets, gross $ 1,193,201 $ 1,191,681
Accumulated Amortization (354,699) (340,334)
Total $ 838,502 851,347
Customer relationships    
Amortization related to intangible assets    
Weighted-average remaining amortization period for intangible assets 17 years 8 months 12 days  
Finite-lived intangible assets, gross $ 857,903 857,903
Accumulated Amortization (274,725) (264,675)
Total $ 583,178 593,228
Customer contracts    
Amortization related to intangible assets    
Weighted-average remaining amortization period for intangible assets 19 years  
Finite-lived intangible assets, gross $ 192,000 192,000
Accumulated Amortization (46,080) (44,160)
Total $ 145,920 147,840
Right-of-way and easements    
Amortization related to intangible assets    
Weighted-average remaining amortization period for intangible assets 28 years 4 months 24 days  
Finite-lived intangible assets, gross $ 100,181 99,964
Accumulated Amortization (22,563) (21,645)
Total $ 77,618 78,319
Debt issuance costs    
Amortization related to intangible assets    
Weighted-average remaining amortization period for intangible assets 3 years 8 months 12 days  
Finite-lived intangible assets, gross $ 22,146 21,841
Accumulated Amortization (5,883) (4,748)
Total $ 16,263 17,093
Executory contracts and other agreements    
Amortization related to intangible assets    
Weighted-average remaining amortization period for intangible assets 22 years 8 months 12 days  
Finite-lived intangible assets, gross $ 20,971 19,973
Accumulated Amortization (5,448) (5,106)
Total $ 15,523 $ 14,867