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Note 12 (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 18 Months Ended |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2012 | Jul. 31, 2011 | Oct. 31, 2011 | Apr. 30, 2011 | Apr. 30, 2012 Common Class A [Member] From Note Exchange [Member] | Jul. 31, 2012 Common Class A [Member] From Note Exchange [Member] | Jul. 31, 2012 Minimum [Member] | Jul. 31, 2012 Maximum [Member] | Apr. 30, 2011 Initial [Member] | Apr. 30, 2011 Additional [Member] | Jul. 31, 2012 From Note Exchange [Member] | Jul. 31, 2012 Tangible Equity Units [Member]
Tangible Equity Units, Units Issued in Period |  |  |  |  |  |  |  |  |  |  | 3,000,000 | 450,000 |  |
Tangible Equity Units, Rate | 7.25% |  | 7.25% |  |  | 7.25% |  |  |  |  |  |  |  |
Subordinated Debt (in Dollars) | $ 7,004,000 |  | $ 7,004,000 |  | $ 13,323,000 |  |  |  |  |  |  |  |  |
Tangible Equity Units, Cash Installment, Per Note (in Dollars per share) | $ 0.453125 |  | $ 0.453125 |  |  |  |  |  |  |  |  |  |  |
Tangible Equity Units Rate Per Year | 7.25% |  | 7.25% |  |  |  |  |  |  |  |  |  |  |
Tangible Equity Units, Stated Amount (in Dollars per share) | $ 25 |  | $ 25 |  |  |  |  |  |  |  |  |  |  |
Tangible Equity Units, Annual Interest Rate | 12.072% |  | 12.072% |  |  |  |  |  |  |  |  |  |  |
Tangible Equity Units, Number of Shares Upon Conversion, Per Unit |  |  |  |  |  |  |  |  | 4.7655 | 5.8140 |  |  |  |
Prepaid Stock Purchase Contracts Issued (in Dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,100,000
Tangible Equity Units, Number Converted | 1,500,000 |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |
Stock Issued (in Dollars) | 5,379,383 |  | 8,443,713 |  |  |  | 3,100,000 |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt (in Dollars) | $ 6,230,000 | $ (1,391,000) | $ 57,966,000 | $ (3,035,000) |  |  |  |  |  |  |  |  | $ 200,000 |

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- Definition Amount of shares issued of common stock upon settlement of prepaid common stock purchase contracts as a component of tangible equity units which include both senior subordinated amortizing notes and a prepaid stock purchase contract. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20, 21 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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