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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Apr. 01, 2020
Mar. 31, 2019
Mar. 31, 2018
Significant Accounting Policies [Line Items]        
Equity method investment, impairment loss $ 0      
Allowance for doubtful accounts $ 22,360  
Forecast [Member]        
Significant Accounting Policies [Line Items]        
ROU assets   $ 110,000    
Operating lease liability   $ 125,000    
Capitalized Software Developed for Internal Use [Member]        
Significant Accounting Policies [Line Items]        
Useful life 3 years      
Capitalized Software Developed for Sale [Member]        
Significant Accounting Policies [Line Items]        
Useful life 3 years