Schedule of Acquired Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Cost	$ 81,709	$ 81,912
Accumulated Amortization	(29,257)	(27,227)
Net	52,452	54,685
Acquired Software
Finite-Lived Intangible Assets [Line Items]
Cost	24,857	24,919
Accumulated Amortization	(19,185)	(17,943)
Net	5,672	6,976
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Cost	32,675	32,754
Accumulated Amortization	(9,045)	(8,492)
Net	23,630	24,262
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	4,642	4,760
Accumulated Amortization	(466)	(306)
Net	4,176	4,454
Net Beneficial Leases
Finite-Lived Intangible Assets [Line Items]
Cost	336	336
Accumulated Amortization	(334)	(334)
Net	2	2
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Cost	324	343
Accumulated Amortization	(83)	(57)
Net	241	286
Other
Finite-Lived Intangible Assets [Line Items]
Cost	275	200
Accumulated Amortization	(144)	(95)
Net	$ 131	$ 105