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3% Convertible Senior Notes (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2009 | Apr. 30, 2012
3% Convertible Senior Notes [Abstract] |  |
Debt Instrument, Issuance Date |  | May 08, 2009
Debt Instrument, Face Amount | $ 200,000,000 |
Net proceeds from debt issuance | 194,541,000 |
Aggregate amount of initial purchasers' discount and other transaction costs related to debt issuance | 5,459,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.00% |
Debt Instrument, Convertible, Conversion Price |  | $ 34.25
Debt Instrument, Convertible, Conversion Ratio |  | 29.1932
Original principal amount of each 3.0% convertible senior note |  | $ 1,000
Debt Instrument, Call Date, Earliest |  | May 05, 2014
Debt Instrument, First Put Date |  | May 01, 2014
Debt Instrument, Second Put Date |  | May 01, 2019
Debt Instrument, Third Put Date |  | May 01, 2024
Debt Instrument, Maturity Date |  | May 01, 2029

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- Definition The first scheduled date that the holders of the convertible senior notes can require issuer to repurchase some or all of the outstanding convertible senior notes solely for cash. + References No definition available. + Details
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- Definition Earliest date before maturity when the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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