Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jul. 31, 2011	Jul. 31, 2010
Income Taxes (Textuals) [Abstract]
Effective tax rate	33.20%	31.30%
Amount unrecognized tax benefit could decrease in next 12 months	$ 1.1
Income tax expenses increased	$ 8.4

Income Taxes.

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- Definition

Amount that income tax expense increased compared to the prior period.

+ Details

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- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 47

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Subparagraph 2
-Article 4

+ Details

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- Definition

For a tax position taken for which it is reasonably possible that the total amount of unrecognized tax benefit will significantly increase or decrease within twelve months of the balance sheet date, provide an estimate of the range of the reasonably possible change.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph d(3)

+ Details

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