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Guarantor and Non-Guarantor Financial Information (Details Textual) - 3.50% Senior Notes due October 15, 2021 [Member]	Apr. 30, 2015
Guarantor and Non Guarantor Financial Information (Textual) [Abstract]
Interest rate on notes	3.50%
Percentage ownership of wholly-owned subsidiaries	100.00%

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- Definition

Guarantor and non-guarantor financial information.

+ References

No definition available.

+ Details

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- Definition

Percentage ownership of wholly owned subsidiaries.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.22(a)(1))



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 22



-Article 5

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