Income Taxes (Details Textuals) (USD $)	3 Months Ended	12 Months Ended
Jul. 31, 2011	Jul. 31, 2010	Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Income Taxes (Textuals) [Abstract]
Valuation allowance for other deferred tax assets			$ 137,000
Valuation allowance increase (decrease)			146,000	5,556,000	864,000
Undistributed earnings of foreign subsidiaries on which deferred income taxes not provided			194,058,000
Amount unrecognized tax benefit could decrease in next 12 months	1,100,000		1,874,000
Company's unrecognized tax benefits			20,261,000	15,322,000	13,794,000
Unrecognized tax benefits that would affect the effective tax rate			13,939,000	11,321,000
Tax-related net interest and penalties			1,792,000	2,289,000
Tax-related net interest and penalties credited to earnings			497,000	594,000	1,982,000
Effective tax rate	33.20%	31.30%	33.10%	32.40%	32.90%
Income tax expenses increased	$ 8,400,000

Income Taxes.

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

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- Definition

Net interest and penalty activity that occurs in conjunction with the Company's FIN 48 tax positions. Interest and penalties accrue on the tax positions as they remain outstanding over a period of time. When the tax positions expire (statute of limitations has passed on a specific tax year), the interest and penalties that have accrued are then reversed.

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Undistributed earnings of foreign subsidiaries of which the Company has asserted will be indefinitely reinvested, and therefore deferred income taxes have not been provided.

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- Definition

Valuation Allowance for other Deferred Tax assets.

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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

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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)

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The gross amount of unrecognized tax benefits (tax reductions recognized in financial reports but excluded from tax returns) pertaining to uncertain tax positions taken in tax returns as of the beginning balance sheet date, excluding amounts pertaining to examined tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 21

-Subparagraph a

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 21

-Subparagraph c

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 15, 16

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 21

-Subparagraph b

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 43

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 26

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