Intangible Assets (Details 1) (USD $) In Thousands	6 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Activity Related to the intangible assets
Balance as of April 1	$ 16,890	$ 20,145
Acquisition	7,630
Amortization	(1,979)	(1,595)
Balance as of September 30	22,541	18,550
Customer Relationships [Member]
Activity Related to the intangible assets
Balance as of April 1	6,327	7,849
Acquisition	1,700
Amortization	(922)	(712)
Balance as of September 30	7,105	7,137
Trade Name [Member]
Activity Related to the intangible assets
Balance as of April 1	208	368
Amortization	(80)	(80)
Balance as of September 30	128	288
Software Technology [Member]
Activity Related to the intangible assets
Balance as of April 1	10,355	11,928
Acquisition	5,930
Amortization	(977)	(803)
Balance as of September 30	$ 15,308	$ 11,125

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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