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Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Income Taxes [Line Items]    
Deferred tax asset reflecting the benefit of deductions from the exercise of stock options $ 14.9  
Excess tax deductions from stock option exercised 52.3  
Expiration of other tax credit carryforwards   March 31, 2013 through 2032
Repatriation amount in the form of a loan 13.2  
Foreign subsidiaries undistributed earnings 149.0  
Stock options exercised 2006 through 2012  
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 1.1 0.3
Federal [Member]
    
Income Taxes [Line Items]    
Net operating loss carryforwards 620.0  
Research and development and other tax credit carryforwards 7.4  
State [Member]
    
Income Taxes [Line Items]    
Net operating loss carryforwards 329.0  
Amount available to offset federal and state income taxes 2.8  
Power Quality Systems, Inc. [Member]
    
Income Taxes [Line Items]    
Net operating loss carryforwards 3.7  
U.S [Member]
    
Income Taxes [Line Items]    
Income tax examination years March 31, 1995 through 2012  
Austria [Member]
    
Income Taxes [Line Items]    
Net operating loss carryforwards 67.0  
Foreign subsidiaries undistributed earnings 147.0  
Income tax examination years 2007 through 2013  
China [Member]
    
Income Taxes [Line Items]    
Net operating loss carryforwards $ 13.8  
Income tax examination years 2008 through 2011