SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions	12 Months Ended
	Mar. 31, 2019 USD ($) Customer	Mar. 31, 2018 USD ($) Customer	Mar. 31, 2017 USD ($) Customer	Jul. 02, 2018	May 31, 2015
Product Information [Line Items]
Revenue From Contracts With Customers, Percentage Associated With Non-cancellable Maintenance And Support Contracts	85.00%
Duration of fiscal year	364 days	371 days	364 days
Advertising expense	$ 1.2	$ 0.9	$ 1.8
Number of customers accounting for 10% or more of net accounts receivable | Customer			1
Accounts Receivable Financing, Gross	158.7
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	81.8
Accounts Receivable Financing, Current	40.5
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	21.5
Financing Agreement, Fees	$ 3.0
Minimum
Product Information [Line Items]
Product warranty terms			1 year
Maximum
Product Information [Line Items]
Product warranty terms			2 years
D&H Distributors And Ingram Micro [Member] | Customer concentration risk | Accounts receivable
Product Information [Line Items]
Number of customers accounting for 10% or more of net accounts receivable | Customer		2
Scansource, D&H Distributors And Ingram Micro [Member] | Customer concentration risk | Accounts receivable
Product Information [Line Items]
Number of customers accounting for 10% or more of net accounts receivable | Customer	3
Ingram Micro [Member] | Customer concentration risk | Accounts receivable
Product Information [Line Items]
Concentration risk percentage	21.30%	12.40%
ScanSource [Member] | Customer concentration risk | Accounts receivable
Product Information [Line Items]
Concentration risk percentage	19.20%
D&H Distributors [Member] | Customer concentration risk | Accounts receivable
Product Information [Line Items]
Concentration risk percentage	10.90%	13.00%
Triangle [Member]
Product Information [Line Items]
Ownership percentage				16.00%
5.50% Senior Notes | Senior notes
Product Information [Line Items]
Stated interest rate			5.50%		5.50%