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Business Segment And Geographic Information (Narrative) (Details) (USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Segment Reporting Information [Line Items]
Number of reportable business segments	2
Stock-based compensation expense	$ 9,864,000	$ 13,412,000	$ 13,494,000
Write-off of Advanced Payment to The Switch	20,551,000
Restructuring and impairment charges	9,200,000
Patent costs	$ 4,917,000
Customer One [Member]
Segment Reporting Information [Line Items]
Percentage of total revenue	18.00%
Cutomer Two [Member]
Segment Reporting Information [Line Items]
Percentage of total revenue	11.00%
Sinovel [Member]
Segment Reporting Information [Line Items]
Percentage of total revenue		68.00%	70.00%
Foreign Countries [Member]
Segment Reporting Information [Line Items]
Percentage of total revenue	72.00%	93.00%	87.00%

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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

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-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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