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Significant Accounting Policies (Details)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Mar. 31, 2013
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Mar. 31, 2012
KRW
Mar. 31, 2013
Tools [Member]
USD ($)
Mar. 31, 2012
Tools [Member]
USD ($)
Consolidation principles [Abstract]            
Capital contributions   $ 0.9   1,000.0    
Tooling [Abstract]            
Property, plant and equipment, depreciable lives         3 years  
Company-owned tooling, net         30.5 27.4
Customer owned tooling receivable         20.9 14.2
Shipping and handling costs [Abstract]            
Shipping and handling costs 4.3 5.4 4.8      
Revenue recognition under licensing arrangements (royalty payments) [Abstract]            
Licensing revenue 1.0 1.2 1.6      
Research and development [Abstract]            
Research and development cost 68.4 70.2 67.0      
Trade receivables and allowance for doubtful accounts [Abstract]            
Trade receivables, allowance for doubtful accounts 0.8 0.8        
Trade receivables sold without recourse 99.1 113.5 47.8      
Loss on the sale of accounts receivables 0.3 0.5 0.2      
Out of period adjustment [Abstract]            
Out of period adjustment to pre-tax earnings $ 0.5 $ (0.5)