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Notes Payable (Details Textual) (USD $) | 6 Months Ended |  | 6 Months Ended | 12 Months Ended |  |  | 6 Months Ended | 12 Months Ended |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2012 | Oct. 31, 2011 | Apr. 30, 2011 | Oct. 31, 2012 4% senior convertible notes [Member] | Apr. 30, 2012 4% senior convertible notes [Member] | Apr. 30, 2011 4% senior convertible notes [Member] | Jul. 31, 2012 4% senior convertible notes [Member] | Dec. 15, 2006 4% senior convertible notes [Member] | Oct. 31, 2012 9.5% Senior notes due 2016 [Member] | Apr. 30, 2011 9.5% Senior notes due 2016 [Member] | Jun. 15, 2012 9.5% Senior notes due 2016 [Member] | Dec. 15, 2011 9.5% Senior notes due 2016 [Member] | Oct. 31, 2012 9.5% Senior notes due 2016 [Member] Minimum [Member] | Oct. 31, 2012 9.5% Senior notes due 2016 [Member] Maximum [Member] | Oct. 31, 2012 Credit Facilities [Member]
Notes Payable (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in revolving line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,000,000
Date until availability is provided |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 07, 2014
Interest Description of revolving Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Variable rate equal to LIBOR or prime plus an applicable margin based on our leverage ratio
Borrowings outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Interest rate on borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50%
Notes issued |  |  |  |  |  |  |  | 80,000,000 |  | 50,000,000 |  |  |  |  |
Amount of convertible debt exchanged |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maturity Date |  |  |  | Dec. 15, 2026 |  |  |  |  |  |  |  |  |  |  |
Convertible Notes Exchanged Amount |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |
Senior Notes Exchanged Amount |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |
Convertible Notes repurchased |  |  |  |  | 30,000,000 |  |  |  | 6,400,000 |  |  |  |  |  |
Convertible Notes Outstanding Amount |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 4.00% |  |  | 9.50% | 9.50% |  |  |
Interest Paid on Purchase of Senior Notes | $ 3,013,000 | $ 2,649,000 |  |  |  |  |  |  | $ 552,000 |  |  |  |  |  |
Consolidated Coverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  | 1.00 | 2.00 |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
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