Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Intangible assets, other than capitalized software development costs
Gross carrying amount	$ 33,833	$ 22,962
Accumulated amortization	(10,574)	(6,072)
Net intangible assets	23,259	16,890	20,145
Customer Relationships [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	13,706	10,206
Accumulated amortization	(5,901)	(3,879)
Net intangible assets	7,805	6,327	7,849
Trade Name [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	768	637
Accumulated amortization	(606)	(429)
Net intangible assets	162	208	368
Software Technology [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	19,359	12,119
Accumulated amortization	(4,067)	(1,764)
Net intangible assets	$ 15,292	$ 10,355	$ 11,928