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

Commitment and Contingencies (Details Textual)

v2.4.0.6
Commitment and Contingencies (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Dec. 17, 2010
Sep. 30, 2010
Commitment and Contingencies (Textual) [Abstract]          
Litigation settlement         $ 10.3
Litigation settlement percentage of costs payable       90.00%  
Rental expense 16.0 15.3 13.2    
Acquisition of plant and equipment and other purchase obligations $ 0.7