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Related Party Transactions (Narrative) (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2021
USD ($)
$ / employee
Mar. 31, 2020
USD ($)
Related Party Transaction [Line Items]    
Long-term debt, excluding current portion $ 4,734,775 $ 4,710,294
Blackstone Portfolio Companies [Member]    
Related Party Transaction [Line Items]    
Revenue recognized related to services provided 3,792  
Amount paid related to services received $ 18,057  
Employer Healthcare Program Agreement [Member]    
Related Party Transaction [Line Items]    
Service fee per participating employee per month | $ / employee 1.00  
Option Agreement [Member[ | McKesson Corporation [Member]    
Related Party Transaction [Line Items]    
Maximum percentage of ownership in the outstanding units of the Joint Venture allowed for option to acquire can be exercised 5.00%  
Transition Services Agreements [Member]    
Related Party Transaction [Line Items]    
Transition fee income $ 283  
Senior Credit Facilities [Member] | GSO-Managed Funds [Member]    
Related Party Transaction [Line Items]    
Long-term debt, excluding current portion $ 162,189 $ 151,301