COMMITMENTS AND CONTINGENCIES - Narrative (Details) £ in Millions			1 Months Ended						12 Months Ended	36 Months Ended
	Sep. 14, 2018 USD ($)	Oct. 13, 2017 USD ($)	Feb. 28, 2021 USD ($)	Nov. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jul. 31, 2018 USD ($)	Oct. 31, 2017 patent	Mar. 31, 2016 patent subsidiary	Mar. 31, 2020 GBP (£) company	Mar. 30, 2020 company	Mar. 31, 2020 USD ($)	Feb. 05, 2020 USD ($)	Apr. 03, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Number of companies acquired | company									2	3
Fair value of contingent liability											$ 1,748,000
Contingent consideration														$ 762,000
Number of subsidiary entities | subsidiary								2
Number of patents allegedly infringed | patent							3	5
Loss contingency, damages awarded, value					$ 2,800,000
Unconditional purchase obligation											35,500,000
Pro Forma [Member]
Commitments and Contingencies Disclosure [Line Items]
Value added tax receivable | £									£ 16
Pre-Suit Damages
Commitments and Contingencies Disclosure [Line Items]
Loss contingency, damages awarded, value		$ 3,500,000
Post-Suit Damages
Commitments and Contingencies Disclosure [Line Items]
Loss contingency, damages awarded, value		$ 2,250,000
Gigavation
Commitments and Contingencies Disclosure [Line Items]
Fair value of contingent liability											700,000	$ 800,000
Gigavation | Scenario, Forecast
Commitments and Contingencies Disclosure [Line Items]
Payments of contingent consideration			$ 700,000
Eastwind
Commitments and Contingencies Disclosure [Line Items]
Fair value of contingent liability											1,000,000.0		$ 1,000,000
Efflux Systems, Inc.
Commitments and Contingencies Disclosure [Line Items]
Fair value of contingent liability															$ 500,000
Payments of contingent consideration						$ 500,000
Simena LLC
Commitments and Contingencies Disclosure [Line Items]
Fair value of contingent liability															$ 4,900,000
Payments of contingent consideration				$ 5,000,000.0
Minimum
Commitments and Contingencies Disclosure [Line Items]
Estimated litigation liability											0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Handheld Network Test Tools Business
Commitments and Contingencies Disclosure [Line Items]
Contingent consideration related to the divestiture	$ 2,300,000				$ 2,300,000									800,000
Contingent consideration measurement period	2 years				2 years
Contingent consideration											$ 0			$ 800,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Maximum | Handheld Network Test Tools Business
Commitments and Contingencies Disclosure [Line Items]
Contingent consideration related to the divestiture	$ 4,000,000.0				$ 4,000,000.0