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Income Taxes (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Taxes [Line Items]        
Provision for income taxes $ 33.8 $ 41.5 $ 45.2 $ 59.3
Effective tax rate 25.70% 26.60% 22.90% 22.00%
United States federal statutory rate     35.00%  
Overall effect of foreign tax rates on effective tax rate 7.20% 6.70% 9.30% 8.90%
Discrete tax benefits associated with tax authority settlement       $ 6.2
Prior years' impact of discrete net tax benefits on effective tax rate       2.30%