v3.26.1
Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Mar. 31, 2026
Amortization related to intangible assets    
Finite-lived intangible assets, gross $ 1,199,805 $ 1,195,102
Accumulated Amortization (405,622) (389,992)
Total $ 794,183 805,110
Customer relationships    
Amortization related to intangible assets    
Weighted average remaining amortization period for intangible assets 17 years  
Finite-lived intangible assets, gross $ 857,903 857,903
Accumulated Amortization (314,928) (304,877)
Total $ 542,975 553,026
Customer contracts    
Amortization related to intangible assets    
Weighted average remaining amortization period for intangible assets 18 years  
Finite-lived intangible assets, gross $ 192,000 192,000
Accumulated Amortization (53,760) (51,840)
Total $ 138,240 140,160
Right-of-way and easements    
Amortization related to intangible assets    
Weighted average remaining amortization period for intangible assets 25 years 8 months 12 days  
Finite-lived intangible assets, gross $ 117,281 111,980
Accumulated Amortization (31,152) (28,367)
Total $ 86,129 83,613
Executory contracts and other agreements    
Amortization related to intangible assets    
Weighted average remaining amortization period for intangible assets 22 years 10 months 24 days  
Finite-lived intangible assets, gross $ 18,763 19,324
Accumulated Amortization (4,332) (4,654)
Total $ 14,431 14,670
Debt issuance costs    
Amortization related to intangible assets    
Weighted average remaining amortization period for intangible assets 2 years 7 months 6 days  
Finite-lived intangible assets, gross $ 13,858 13,895
Accumulated Amortization (1,450) (254)
Total $ 12,408 $ 13,641