Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012
Intangible assets, other than capitalized software development costs
Gross carrying amount	$ 72,033	$ 45,683
Accumulated amortization	(22,195)	(18,133)
Net intangible assets	49,838	27,550	31,299	23,259
Customer Relationships [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	25,956	23,156
Accumulated amortization	(12,177)	(10,028)
Net intangible assets	13,779	13,128	15,235	7,805
Trade Name & Contracts [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	3,368	2,018
Accumulated amortization	(1,295)	(1,112)
Net intangible assets	2,073	906	1,082	162
Software Technology [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	42,709	20,509
Accumulated amortization	(8,723)	(6,993)
Net intangible assets	$ 33,986	$ 13,516	$ 14,982	$ 15,292