Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Intangible assets, other than capitalized software development costs
Gross carrying amount	$ 45,683	$ 33,833
Accumulated amortization	(16,268)	(10,574)
Net intangible assets	29,415	23,259	24,585	16,890
Customer Relationships [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	23,156	13,706
Accumulated amortization	(8,976)	(5,901)
Net intangible assets	14,180	7,805	8,407	6,327
Trade Name & Contracts [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	2,018	768
Accumulated amortization	(1,030)	(606)
Net intangible assets	988	162	213	208
Software Technology [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	20,509	19,359
Accumulated amortization	(6,262)	(4,067)
Net intangible assets	$ 14,247	$ 15,292	$ 15,965	$ 10,355