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Related Party Transactions (Narrative) (Details)
$ in Thousands
3 Months Ended
Jun. 30, 2021
USD ($)
$ / employee
Jun. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Related Party Transaction [Line Items]      
Long-term debt, excluding current portion $ 4,735,332   $ 4,734,775
Blackstone Portfolio Companies [Member]      
Related Party Transaction [Line Items]      
Revenue recognized related to services provided 1,770 $ 1,043  
Amount paid related to services received $ 4,253 $ 5,292  
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 $ 259,569   $ 162,189