Schedule of Acquired Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Cost	$ 87,507	$ 81,912
Accumulated Amortization	(31,441)	(27,227)
Net	56,066	54,685
Acquired Software
Finite-Lived Intangible Assets [Line Items]
Cost	28,598	24,919
Accumulated Amortization	(20,515)	(17,943)
Net	8,083	6,976
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Cost	32,712	32,754
Accumulated Amortization	(9,607)	(8,492)
Net	23,105	24,262
Distributor Relationships
Finite-Lived Intangible Assets [Line Items]
Cost	1,887
Accumulated Amortization	(60)
Net	1,827
Indefinite Lived Trade Name
Finite-Lived Intangible Assets [Line Items]
Cost	18,600	18,600
Accumulated Amortization	0	0
Net	18,600	18,600
Core Technology
Finite-Lived Intangible Assets [Line Items]
Cost	4,698	4,760
Accumulated Amortization	(639)	(306)
Net	4,059	4,454
Net Beneficial Leases
Finite-Lived Intangible Assets [Line Items]
Cost	336	336
Accumulated Amortization	(336)	(334)
Net	0	2
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Cost	332	343
Accumulated Amortization	(111)	(57)
Net	221	286
Other
Finite-Lived Intangible Assets [Line Items]
Cost	344	200
Accumulated Amortization	(173)	(95)
Net	$ 171	$ 105