Acquisitions - Summary of Allocation of Consideration to Fair Value of Tangible and Intangible Assets Acquired and Liabilities Assumed (Detail) (USD $)	Mar. 31, 2014	Jan. 30, 2014 Tomium Software, LLC. [Member]	Mar. 31, 2014 SkyFence Networks Ltd. [Member]	Feb. 07, 2014 SkyFence Networks Ltd. [Member]	Mar. 31, 2013 SkyFence Networks Ltd. [Member]	Feb. 07, 2014 SkyFence Networks Ltd. [Member] Existing Technology [Member]
Business Acquisition [Line Items]
Intangible assets		$ 2,704,000				$ 7,965,000
Goodwill	34,972,000	5,499,000		29,473,000
Total intangible assets acquired		8,203,000
Other acquired tangible assets		60,000
Fair value of assets acquired		8,263,000
Net tangible assets				1,014,000
Deferred tax liability assumed			(259,000)	(1,528,000)	(124,000)
Total purchase price				$ 36,924,000