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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jan. 31, 2012
Income Taxes (Textual) [Abstract]
Effective rate	33.70%
Expected tax rate on ordinary income	33.40%
Decrease in gross unrecognized tax benefits	$ 9.3

- 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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