Annual report pursuant to Section 13 and 15(d)

Impairment Charges (Details)

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Impairment Charges (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Impairment Charges    
Impairment charges $ 7.3 $ 15.8
Trademark impairment 0.3  
Trademarks
   
Impairment Charges    
Trademark impairment 0.3  
Impairment charges, basic and diluted (in dollars per share) $ 0.01  
Tantalum
   
Impairment Charges    
Impairment charges 3.1 15.8
Impairment charges, basic and diluted (in dollars per share) $ 0.07  
Impairment charges, basic (in dollars per share)   $ 0.36
Impairment charges, diluted (in dollars per share)   $ 0.30
Net carrying value of idle equipment to be disposed of   15.8
Film and Electrolytic
   
Impairment Charges    
Impairment charges $ 4.2  
Impairment charges, basic and diluted (in dollars per share) $ 0.09  
Number of manufacturing facilities within Italy 2