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Intangible Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Amortizable    
Finite-lived intangible assets, gross $ 1,757,835 $ 1,301,206
Accumulated amortization (566,054) (503,117)
Finite-lived intangible assets, net 1,191,781 798,089
INTANGIBLE ASSETS, net of accumulated amortization 1,194,581 800,889
Non-Amortizable    
Gross carrying amount of intangible assets $ 1,760,635 1,304,006
Weighted-average remaining amortization period for intangible assets 16 years 2 months 12 days  
Trade names    
Non-Amortizable    
Indefinite-lived intangible assets $ 2,800 2,800
Customer relationships    
Amortizable    
Finite-lived intangible assets, gross 982,932 742,832
Accumulated amortization (406,049) (369,983)
Finite-lived intangible assets, net $ 576,883 372,849
Customer relationships | Minimum    
Amortizable    
Amortizable life 3 years  
Customer relationships | Maximum    
Amortizable    
Amortizable life 30 years  
Customer commitments    
Amortizable    
Finite-lived intangible assets, gross $ 500,000 310,000
Accumulated amortization (92,317) (74,917)
Finite-lived intangible assets, net $ 407,683 235,083
Customer commitments | Minimum    
Amortizable    
Amortizable life 10 years  
Customer commitments | Maximum    
Amortizable    
Amortizable life 25 years  
Pipeline capacity rights    
Amortizable    
Amortizable life 30 years  
Finite-lived intangible assets, gross $ 7,800 7,799
Accumulated amortization (1,517) (1,387)
Finite-lived intangible assets, net 6,283 6,412
Rights-of-way and easements    
Amortizable    
Finite-lived intangible assets, gross 85,001 73,409
Accumulated amortization (5,616) (4,509)
Finite-lived intangible assets, net $ 79,385 68,900
Rights-of-way and easements | Minimum    
Amortizable    
Amortizable life 1 year  
Rights-of-way and easements | Maximum    
Amortizable    
Amortizable life 45 years  
Water rights    
Amortizable    
Finite-lived intangible assets, gross $ 64,868 64,868
Accumulated amortization (5,479) (3,018)
Finite-lived intangible assets, net $ 59,389 61,850
Water rights | Minimum    
Amortizable    
Amortizable life 13 years  
Water rights | Maximum    
Amortizable    
Amortizable life 14 years  
Executory contracts and other agreements    
Amortizable    
Finite-lived intangible assets, gross $ 55,030 47,230
Accumulated amortization (18,636) (17,212)
Finite-lived intangible assets, net $ 36,394 30,018
Executory contracts and other agreements | Minimum    
Amortizable    
Amortizable life 5 years  
Executory contracts and other agreements | Maximum    
Amortizable    
Amortizable life 30 years  
Non-compete agreements    
Amortizable    
Finite-lived intangible assets, gross $ 19,823 12,723
Accumulated amortization (4,363) (2,570)
Finite-lived intangible assets, net $ 15,460 10,153
Non-compete agreements | Minimum    
Amortizable    
Amortizable life 2 years  
Non-compete agreements | Maximum    
Amortizable    
Amortizable life 24 years  
Debt issuance costs    
Amortizable    
Amortizable life 5 years  
Finite-lived intangible assets, gross $ 42,381 42,345
Accumulated amortization (32,077) (29,521)
Finite-lived intangible assets, net $ 10,304 $ 12,824