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Business Combinations (PDX, Inc. - Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Business Acquisition [Line Items]      
Revenue   $ 3,290,734 $ 3,133,907
PDX, Inc. [Member]      
Business Acquisition [Line Items]      
Ownership interest acquired 100.00%    
Total consideration $ 198,291    
Revenue   $ 57,599