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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]      
Total revenues $ 723,472 $ 670,885 $ 710,957
Americas      
Disaggregation of Revenue [Line Items]      
Total revenues 424,122 390,860 430,380
EMEA      
Disaggregation of Revenue [Line Items]      
Total revenues 214,431 194,780 191,188
APJ      
Disaggregation of Revenue [Line Items]      
Total revenues 84,919 85,245 89,389
Software and Products Revenue      
Disaggregation of Revenue [Line Items]      
Total revenues 326,843 275,308 309,899
Software and Products Revenue | Americas      
Disaggregation of Revenue [Line Items]      
Total revenues 187,027 141,856 170,114
Software and Products Revenue | EMEA      
Disaggregation of Revenue [Line Items]      
Total revenues 101,673 95,356 95,913
Software and Products Revenue | APJ      
Disaggregation of Revenue [Line Items]      
Total revenues 38,143 38,096 43,872
Customer Support Revenue      
Disaggregation of Revenue [Line Items]      
Total revenues 357,781 360,130 358,747
Customer Support Revenue | Americas      
Disaggregation of Revenue [Line Items]      
Total revenues 215,831 230,226 237,190
Customer Support Revenue | EMEA      
Disaggregation of Revenue [Line Items]      
Total revenues 100,620 88,965 82,895
Customer Support Revenue | APJ      
Disaggregation of Revenue [Line Items]      
Total revenues 41,330 40,939 38,662
Professional Services      
Disaggregation of Revenue [Line Items]      
Total revenues 38,848 35,447 42,311
Professional Services | Americas      
Disaggregation of Revenue [Line Items]      
Total revenues 21,264 18,778 23,076
Professional Services | EMEA      
Disaggregation of Revenue [Line Items]      
Total revenues 12,138 10,459 12,380
Professional Services | APJ      
Disaggregation of Revenue [Line Items]      
Total revenues $ 5,446 $ 6,210 $ 6,855