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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount $ 12,183 $ 19,068
Intangible assets, Accumulated Amortization (8,411) (12,014)
Intangible assets, Net Book Value 3,772 7,054
Licenses [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount 5,360 2,908
Intangible assets, Accumulated Amortization (2,689) (2,100)
Intangible assets, Net Book Value 2,671 808
Intangible assets, Estimated Useful Life (in years) 7  
Patents [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount   9,038
Intangible assets, Accumulated Amortization   (4,891)
Intangible assets, Net Book Value   4,147
Intangible assets, Estimated Useful Life (in years) 7  
Trade Names And Trademarks [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount 1,212 1,281
Intangible assets, Accumulated Amortization (909) (778)
Intangible assets, Net Book Value 303 503
Intangible assets, Estimated Useful Life (in years) 7  
Core Technology And Know-How [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount 5,611 5,841
Intangible assets, Accumulated Amortization (4,813) (4,245)
Intangible assets, Net Book Value $ 798 $ 1,596
Minimum [Member] | Core Technology And Know-How [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Estimated Useful Life (in years) 5  
Maximum [Member] | Core Technology And Know-How [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Estimated Useful Life (in years) 10