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ACQUISITIONS - Narrative (Details) - USD ($) $ in Millions				12 Months Ended
ACQUISITIONS - Narrative (Details) - USD ($) $ in Millions	Jul. 17, 2019	Oct. 29, 2018	Apr. 12, 2018	Mar. 31, 2021
Wavecell Pte. Ltd.
Business Acquisition [Line Items]
Business combination, consideration transferred	$ 117.1
Payments to acquire businesses, gross	72.8
Business combination, consideration transferred, equity interests issued and issuable	44.3
Business combination, acquisition related costs	$ 1.9
Developed technology \| MarianaIQ
Business Acquisition [Line Items]
Useful life (in Years)			2 years
Finite-lived intangible assets, remaining amortization period			2 years
Developed technology \| Jitsi
Business Acquisition [Line Items]
Useful life (in Years)		2 years
Finite-lived intangible assets, remaining amortization period		2 years
Developed technology \| Wavecell Pte. Ltd.
Business Acquisition [Line Items]
Useful life (in Years)	7 years
Time-Based Restricted Stock Awards \| Wavecell Pte. Ltd.
Business Acquisition [Line Items]
Business combination, consideration transferred, equity interests issued and issuable	$ 13.2
Performance-Based Restricted Stock Awards \| Wavecell Pte. Ltd.
Business Acquisition [Line Items]
Business combination, consideration transferred, equity interests issued and issuable	$ 6.6
Vesting period	3 years
Unamortized stock-based compensation expense				$ 8.5
Weighted average period of recognition for unrecognized compensation expense				1 year 3 months 18 days
Employee Stock \| Employee Stock Purchase Plan
Business Acquisition [Line Items]
Unamortized stock-based compensation expense				$ 2.5
Weighted average period of recognition for unrecognized compensation expense				4 months 24 days