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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Income Tax Disclosure [Line Items]  
Unrecognized tax benefits $ 19.9
Unrecognized tax benefits that would impact effective tax rate 13.1
Unrecognized tax benefits excluding interest and penalties 2.7
Accrued income tax-related interest expense 3.3
Penalties accrued 1.1
Total amount of accrued income tax-related interest $ 0.3