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Related Party Transactions (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / employee
Sep. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Related Party Transaction [Line Items]          
Long-term debt, excluding current portion $ 4,643,245   $ 4,643,245   $ 4,734,775
Amount paid related to services received 4,688 $ 4,166 $ 8,941 $ 9,458  
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 $ 286,096   $ 286,096   $ 162,189