Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Intangible assets, other than capitalized software development costs
Gross carrying amount	$ 45,683	$ 33,833
Accumulated amortization	(18,133)	(10,574)
Net intangible assets	27,550	23,259	16,890
Customer Relationships [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	23,156	13,706
Accumulated amortization	(10,028)	(5,901)
Net intangible assets	13,128	7,805	6,327
Trade Name [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	2,018	768
Accumulated amortization	(1,112)	(606)
Net intangible assets	906	162	208
Software Technology [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	20,509	19,359
Accumulated amortization	(6,993)	(4,067)
Net intangible assets	$ 13,516	$ 15,292	$ 10,355