Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011
Intangible assets, other than capitalized software development costs
Gross carrying amount	$ 45,683	$ 33,833
Accumulated amortization	(12,391)	(10,574)
Net intangible assets	33,292	23,259	17,919	16,890
Customer Relationships [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	23,156	13,706
Accumulated amortization	(6,868)	(5,901)
Net intangible assets	16,288	7,805	6,985	6,327
Trade Name & Contracts [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	2,018	768
Accumulated amortization	(733)	(606)
Net intangible assets	1,285	162	168	208
Software Technology [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	20,509	19,359
Accumulated amortization	(4,790)	(4,067)
Net intangible assets	$ 15,719	$ 15,292	$ 10,766	$ 10,355