GOODWILL AND INTANGIBLE ASSETS - Additional Information (Detail) (USD $)	3 Months Ended					12 Months Ended		3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014	Jun. 30, 2014 Trade name	Mar. 31, 2014 Trade name	Mar. 31, 2014 Developed Technology, Accanto Systems	Mar. 31, 2014 Developed technology	Jun. 30, 2014 Acquired software and core technology	Jun. 30, 2014 Acquired software and core technology Included as cost of product revenue	Jun. 30, 2013 Acquired software and core technology Included as cost of product revenue	Jun. 30, 2014 Other acquired intangible assets Included as operating expense	Jun. 30, 2013 Other acquired intangible assets Included as operating expense	Jun. 30, 2014 Customer relationships	Jun. 30, 2014 Unified Service Delivery	Mar. 31, 2014 Unified Service Delivery	Jun. 30, 2014 Test Optimization	Mar. 31, 2014 Test Optimization
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 203,034,000		$ 203,446,000											$ 200,600,000	$ 201,000,000	$ 2,400,000	$ 2,400,000
Carrying value of intangible assets	56,643,000		58,513,000
Payments to acquire software rights	71,000	110,000				500,000	300,000
Weighted average useful life of acquired intangible assets	10 years 1 month 6 days					6 years 3 months 18 days	3 years	6 years 8 months 12 days					13 years 3 months 18 days
Indefinite-lived intangible assets				18,600,000	18,600,000
Amortization expenses	$ 862,000	$ 854,000							$ 934,000	$ 819,000	$ 901,000	$ 854,000