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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]      
Effective tax rate 34.00% 32.00% (5.00%)
Tax benefit recognized     $ 2.5
Effective tax rate, excluding discrete items     22.00%