Composition of Certain Financial Statement Captions - Summary of Current and Non-Current Deferred Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 52,843	$ 52,383
Professional Services [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	21,887	21,889
Software License, Hardware and Other [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	12,251	12,680
Support and Maintenance [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	9,436	9,691
Software Related Subscription Services [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 9,269	$ 8,123