Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Property, Plant and Equipment (Details Textual)

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Property, Plant and Equipment (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Property, Plant and Equipment (Textual) [Abstract]    
Depreciation expense $ 65.2 $ 62.9
Impairment charges 14.3  
Restricted asset value of property, plant and equipment $ 2.3 $ 2.4