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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Deferred tax asset reflecting the benefit of deductions from the exercise of stock options $ 14,900,000  
Operating loss carryforwards expiration years March 31, 2014 through 2033  
Excess tax deductions from stock option exercised 52,400,000  
Stock options exercised dates 2006 through 2013  
Expiration of other tax credit carryforwards March 31, 2014 through 2033  
Repatriated amount 1,500,000  
Federal and state deferred tax liability 5,444,000 3,129,000
Minimum percentage of amount being realized upon ultimate settlement 50.00%  
Unrecognized tax benefits that, if recognized, would result in a reduction of the Company's effective tax rate 1,100,000 1,100,000
Austria [Member]
    
Net operating loss carryforwards 64,400,000  
China [Member]
    
Net operating loss carryforwards 5,400,000 13,800,000
Federal [Member]
    
Net operating loss carryforwards 664,000,000  
Research and development and other tax credit carryforwards 8,100,000  
State [Member]
    
Net operating loss carryforwards 292,000,000  
Research and development and other tax credit carryforwards 3,200,000  
Power Quality Systems, Inc. [Member]
    
Net operating loss carryforwards $ 3,700,000