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Related Party Transactions (Narrative) (Details) - USD ($)
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Related Party Transaction [Line Items]      
Long-term debt, excluding current portion $ 5,027,868,000   $ 4,710,294,000
Blackstone Portfolio Companies [Member]      
Related Party Transaction [Line Items]      
Related party revenue recognized 1,043,000 $ 0  
Purchases from related party $ 5,292,000 0  
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 $ 283,000 $ 0  
Employer Healthcare Program Agreement [Member]      
Related Party Transaction [Line Items]      
Service fee per participating employee per month 1.00    
Senior Credit Facilities [Member] | GSO-Managed Funds [Member]      
Related Party Transaction [Line Items]      
Long-term debt, excluding current portion $ 161,367,000   $ 151,301,000