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Business Segments (Revenue by Geographic Area) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total segment revenues $ 943,365 $ 963,010 $ 975,777
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total segment revenues 799,038 812,653 837,049
Rest of world      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total segment revenues $ 144,327 $ 150,357 $ 138,728