REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Revenues from External Customers and Long-Lived Assets
Revenue	$ 412,752	$ 372,827	$ 349,576
Americas
Revenues from External Customers and Long-Lived Assets
Revenue	$ 250,195	$ 206,560	$ 194,692
Americas | Geographic Concentration Risk | Revenue Benchmark
Revenues from External Customers and Long-Lived Assets
Concentration risk percentage	61.00%	55.00%	56.00%
EMEA
Revenues from External Customers and Long-Lived Assets
Revenue	$ 112,160	$ 114,917	$ 108,770
EMEA | Geographic Concentration Risk | Revenue Benchmark
Revenues from External Customers and Long-Lived Assets
Concentration risk percentage	27.00%	31.00%	31.00%
APAC
Revenues from External Customers and Long-Lived Assets
Revenue	$ 36,692	$ 35,973	$ 31,250
APAC | Geographic Concentration Risk | Revenue Benchmark
Revenues from External Customers and Long-Lived Assets
Concentration risk percentage	9.00%	10.00%	9.00%
Product revenue
Revenues from External Customers and Long-Lived Assets
Revenue	$ 266,537	$ 223,761	$ 209,808
Product revenue | Americas
Revenues from External Customers and Long-Lived Assets
Revenue	172,332	124,952	118,653
Product revenue | EMEA
Revenues from External Customers and Long-Lived Assets
Revenue	67,485	70,730	67,509
Product revenue | APAC
Revenues from External Customers and Long-Lived Assets
Revenue	26,720	28,079	23,646
Service and subscription
Revenues from External Customers and Long-Lived Assets
Revenue	132,510	133,689	124,904
Service and subscription | Americas
Revenues from External Customers and Long-Lived Assets
Revenue	77,863	81,608	76,039
Service and subscription | EMEA
Revenues from External Customers and Long-Lived Assets
Revenue	44,675	44,187	41,261
Service and subscription | APAC
Revenues from External Customers and Long-Lived Assets
Revenue	9,972	7,894	7,604
Primary storage systems
Revenues from External Customers and Long-Lived Assets
Revenue	$ 57,578	$ 60,697	$ 70,286
Primary storage systems | Product Concentration Risk | Revenue Benchmark
Revenues from External Customers and Long-Lived Assets
Concentration risk percentage	14.00%	16.00%	20.00%
Secondary storage systems
Revenues from External Customers and Long-Lived Assets
Revenue	$ 175,508	$ 118,310	$ 89,000
Secondary storage systems | Product Concentration Risk | Revenue Benchmark
Revenues from External Customers and Long-Lived Assets
Concentration risk percentage	43.00%	32.00%	25.00%
Device and media
Revenues from External Customers and Long-Lived Assets
Revenue	$ 42,371	$ 50,030	$ 51,164
Device and media | Product Concentration Risk | Revenue Benchmark
Revenues from External Customers and Long-Lived Assets
Concentration risk percentage	10.00%	13.00%	15.00%
Royalty
Revenues from External Customers and Long-Lived Assets
Revenue	$ 13,705	$ 15,377	$ 14,864
Royalty | Geographic Concentration Risk | Revenue Benchmark
Revenues from External Customers and Long-Lived Assets
Concentration risk percentage	3.00%	4.00%	4.00%
Royalty | Product Concentration Risk | Revenue Benchmark
Revenues from External Customers and Long-Lived Assets
Concentration risk percentage	3.00%	4.00%	4.00%
Subscriptions
Revenues from External Customers and Long-Lived Assets
Revenue	$ 8,900	$ 5,300	$ 600
Service and subscription
Revenues from External Customers and Long-Lived Assets
Revenue	$ 123,590	$ 128,413	$ 124,262
Service and subscription | Product Concentration Risk | Revenue Benchmark
Revenues from External Customers and Long-Lived Assets
Concentration risk percentage	30.00%	35.00%	36.00%