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Business and Basis of Presentation (New Lease Accounting Standard) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets $ 0 $ 23,722 $ 28,888
Operating lease liabilities, current portion 0 (5,858) (5,612)
Long-term operating lease liabilities, net of current portion 0 (19,706) (24,877)
Other accrued liabilities $ (60,663) $ (61,402) $ (70,763)
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member    
Cumulative Effect, Period of Adoption, Adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets $ 17,435    
Operating lease liabilities, current portion (5,697)    
Long-term operating lease liabilities, net of current portion (13,296)    
Other accrued liabilities 1,558    
Cumulative Effect, Period of Adoption, Adjusted Balance      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets 17,435    
Operating lease liabilities, current portion (5,697)    
Long-term operating lease liabilities, net of current portion (13,296)    
Other accrued liabilities $ (59,105)