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Related Party Transactions (Narrative) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
item
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Related Party Transaction [Line Items]      
Advances from related party $ 625   $ 15,828
Repayment of advances to related party   $ 9,869  
Ratio of Company outstanding shares to units of Joint Venture held by Company | item 1    
Letter Agreement [Member]      
Related Party Transaction [Line Items]      
Net cash tax savings, percentage payment provided by agreement 100.00%    
Letter Agreement [Member] | McKesson Corporation [Member]      
Related Party Transaction [Line Items]      
Maximum percentage ownership allowed to receive net cash tax savings payment 20.00%    
Option Agreement [Member[      
Related Party Transaction [Line Items]      
Option exercise price | $ / shares $ 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%