Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Mar. 31, 2011
Intangible assets, other than capitalized software development costs
Gross carrying amount	$ 45,683	$ 33,833
Accumulated amortization	(14,384)	(10,574)
Net intangible assets	31,299	23,259	22,541	16,890
Customer Relationships [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	23,156	13,706
Accumulated amortization	(7,921)	(5,901)
Net intangible assets	15,235	7,805	7,105	6,327
Trade Name & Contracts [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	2,018	768
Accumulated amortization	(936)	(606)
Net intangible assets	1,082	162	128	208
Software Technology [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	20,509	19,359
Accumulated amortization	(5,527)	(4,067)
Net intangible assets	$ 14,982	$ 15,292	$ 15,308	$ 10,355