Allocation of Purchase Price (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Allocation of the purchase consideration:
Contractual non-compliance liability	$ (246)	$ (700)
Contingent consideration	(5,087)	(8,213)
Onpath
Allocation of the purchase consideration:
Current assets	8,356
Fixed assets	784
Identifiable intangible assets	10,970
Goodwill	20,590
Deferred tax asset	6,663
Other assets	1,432
Total assets acquired	48,795
Current liabilities	(6,414)
Deferred revenue	(921)
Deferred income tax liabilities	(4,660)
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net, Total	36,800
Accanto Systems Srl
Allocation of the purchase consideration:
Current assets	389
Fixed assets	237
Identifiable intangible assets	5,280
Goodwill	11,157
Total assets acquired	17,063
Current liabilities	(839)
Deferred revenue	(240)
Deferred income tax liabilities	(984)
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net, Total	15,000
Simena
Allocation of the purchase consideration:
Current assets	2,300
Identifiable intangible assets	4,470
Goodwill	14,013
Total assets acquired	20,783
Current liabilities	(338)
Deferred revenue	(759)
Contractual non-compliance liability	(1,600)
Contingent consideration	(8,000)
Fair value of consideration transferred	10,086
Replay
Allocation of the purchase consideration:
Current assets	2,310
Fixed assets	85
Identifiable intangible assets	4,950
Goodwill	15,313
Total assets acquired	22,658
Current liabilities	(74)
Deferred revenue	(715)
Deferred income tax liabilities	(1,632)
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net, Total	20,237
Psytechnics
Allocation of the purchase consideration:
Current assets	1,099
Fixed assets	50
Identifiable intangible assets	4,350
Goodwill	13,179
Total assets acquired	18,678
Current liabilities	(1,198)
Deferred revenue	(466)
Deferred income tax liabilities	3,400
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net, Total	$ 17,014