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Guarantor Subsidiaries And Non-Guarantor Subsidiaries (Narrative) (Details) | Apr. 30, 2012
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6.50% Notes [Member] |
Condensed Financial Statements, Captions [Line Items] |
Debt instrument, interest rate, stated percentage | 6.50%
6.75% Notes [Member] |
Condensed Financial Statements, Captions [Line Items] |
Debt instrument, interest rate, stated percentage | 6.75%

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 + Details
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