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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Oct. 31, 2011
Income Taxes (Textuals) [Abstract]
Effective rate	34.10%
Expected tax rate on ordinary income	32.90%
Decrease in gross unrecognized tax benefits	$ 9.9

- 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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