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Significant Accounting Policies Variable Interest Entities (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2012 Sinotrak
Variable Interest Entity [Line Items]
Ownership interest in Sinotrak, (as a percent)			49.00%
Stockholders' equity attributable to noncontrolling interest	$ 989	$ 0

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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