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Supplemental Disclosure of Noncash Investing and Financing Activities (Details Textual) - USD ($) $ in Millions | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2019 | Jan. 15, 2019 | Oct. 31, 2018 | May 29, 2018 | Feb. 01, 2018 | Jul. 27, 2017
Fair Value of Assets Acquired |  | $ 13 |  |  |  |  |  |
The 8.0% Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Interest Rate of Debt | 8.00% |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.00% |  |  | 8.00% | 8.00% |
The 13.5% Senior Notes Due 2026 [Member] |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Interest Rate of Debt | 13.50% |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 13.50% |
The 5.0% Senior Notes due 2040 [Member] |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Interest Rate of Debt | 5.00% |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 5.00% |
The 10.0% 2022 Notes [Member] | Senior Secured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 10.00% |  | 10.00% |  |  | 10.00%
The 10.5% 2024 Notes [Member] | Senior Secured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 10.50% | 10.50% | 10.50% |  |  | 10.50%
The 7.75% Senior Secured 1.125 Lien Notes due February 15, 2026 [Member] | Senior Secured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.75% |  |  |  |  |
The 11.25% Senior Secured 1.5 Lien Notes due February 15, 2026 [Member] | Senior Secured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 11.25% |  |  |  |  |

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- Definition The rate of interest that was being paid on the original debt issue that is being converted in the 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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