Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2011
Intangible assets, other than capitalized software development costs
Gross carrying amount	$ 45,683	$ 45,683
Accumulated amortization	(19,999)	(18,133)
Net intangible assets	25,684	27,550	33,292	23,259
Customer Relationships [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	23,156	23,156
Accumulated amortization	(11,082)	(10,028)
Net intangible assets	12,074	13,128	16,288	7,805
Trade Name & Contracts [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	2,018	2,018
Accumulated amortization	(1,192)	(1,112)
Net intangible assets	826	906	1,285	162
Software Technology [Member]
Intangible assets, other than capitalized software development costs
Gross carrying amount	20,509	20,509
Accumulated amortization	(7,725)	(6,993)
Net intangible assets	$ 12,784	$ 13,516	$ 15,719	$ 15,292