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Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Jun. 30, 2011	Jun. 30, 2010
Income Taxes
Estimated annual effective tax rate	34.50%	35.80%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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