EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]
Share-based compensation expense before income taxes	$ 1,627,000	$ 1,779,000	$ 5,729,000	$ 5,290,000
Income tax benefit	(555,000)	(641,000)	(1,956,000)	(1,898,000)
Total share-based compensation expense after income taxes	1,072,000	1,138,000	3,773,000	3,392,000
Net impact of share-based compensation on [Abstract]
Basic net income per share (in dollars per share)	$ 0.05	$ 0.05	$ 0.17	$ 0.15
Diluted net income per share (in dollars per share)	$ 0.05	$ 0.05	$ 0.17	$ 0.15
Capitalized share-based compensation costs	165,000		165,000		151,000
Excess tax benefits classified as financing cash inflow	56,000	681,000	1,785,000	1,826,000
2005 Equity Incentive Plan [Member]
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]
Number of equity incentive plans	1		1
Maximum shares authorized for issuance (in shares)	6,786,000		6,786,000
Shares available for future issuance (in shares)	1,016,000		1,016,000
Cost of Revenues [Member]
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]
Share-based compensation expense before income taxes	267,000	228,000	819,000	673,000
Research and Development [Member]
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]
Share-based compensation expense before income taxes	277,000	300,000	859,000	854,000
Sales and Marketing [Member]
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]
Share-based compensation expense before income taxes	433,000	613,000	1,734,000	1,885,000
General and Administrative [Member]
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]
Share-based compensation expense before income taxes	$ 650,000	$ 638,000	$ 2,317,000	$ 1,878,000