Acquisitions - Additional Information (Detail) (USD $)	12 Months Ended		12 Months Ended				12 Months Ended		12 Months Ended			12 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Onpath	Oct. 31, 2012 Onpath	Jan. 31, 2013 Onpath Unified Service Delivery	Jan. 31, 2013 Onpath Test Automation	Mar. 31, 2013 Accanto Systems Srl	Jul. 20, 2012 Accanto Systems Srl	Mar. 31, 2013 Accanto Systems Srl and Onpath	Mar. 31, 2013 Simena	Nov. 18, 2011 Simena	Mar. 31, 2013 Replay	Oct. 03, 2011 Replay	Mar. 31, 2013 Psytechnics	Apr. 02, 2011 Psytechnics
Business Acquisition [Line Items]
Preliminary purchase price allocation period, years	1 year
Total purchase price				$ 41,000,000				$ 15,000,000		$ 18,086,000	$ 10,100,000		$ 20,200,000		$ 17,000,000
Cash consideration to employee and directors				8,200,000
Transaction bonus considered as compensation				4,000,000
Goodwill			20,590,000		17,700,000	3,000,000	11,157,000			14,013,000		15,313,000		13,179,000
Weighted average useful life of identifiable intangible assets acquired	10 years 1 month 6 days		7 years 6 months				7 years 3 months 18 days			10 years		8 years 7 months 6 days		8 years 7 months 6 days
Acquired software intangible, tax deductible amount							2,100,000
Acquisition-related costs									1,400,000
Additional purchase price consideration										10,800,000
Fair value of contingent liability	5,087,000	8,213,000								8,000,000
Net asset balance reserved							(984,000)							3,400,000
Business acquisition, revenue recorded	$ 24,800,000