Note 11 - Senior Notes and Credit Facilities - Senior Notes and Credit Facilities Balances (Details) (Parentheticals)
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6 Months Ended |
12 Months Ended |
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Apr. 30, 2018 |
Oct. 31, 2017 |
Feb. 01, 2018 |
Jan. 11, 2018 |
Dec. 01, 2017 |
| The 9.50% 2020 Notes [Member] | Senior Secured Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
[1],[2] |
9.50%
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9.50%
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| Debt Instrument, Maturity Date |
[1],[2] |
Nov. 15, 2020
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Nov. 15, 2020
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| The 2.0% 2021 Notes [Member] | Senior Secured Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
[1],[2] |
2.00%
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2.00%
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| Debt Instrument, Maturity Date |
[1],[2] |
Nov. 01, 2021
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Nov. 01, 2021
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| The 5.0% 2021 Notes [Member] | Senior Secured Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
[1],[2] |
5.00%
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5.00%
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| Debt Instrument, Maturity Date |
[1],[2] |
Nov. 01, 2021
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Nov. 01, 2021
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| The 10.0% 2022 Notes [Member] | Senior Secured Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
[1],[2] |
10.00%
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10.00%
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| Debt Instrument, Maturity Date |
[1],[2] |
Jul. 15, 2022
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Jul. 15, 2022
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| The 10.5% 2024 Notes [Member] | Senior Secured Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
[1],[2] |
10.50%
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10.50%
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| Debt Instrument, Maturity Date |
[1],[2] |
Jul. 15, 2024
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Jul. 15, 2024
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| The 7.0% 2019 Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
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7.00%
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| The 7.0% 2019 Notes [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
[1],[2] |
7.00%
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7.00%
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| Debt Instrument, Maturity Date |
[1],[2] |
Jan. 15, 2019
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Jan. 15, 2019
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| The 8.0% Senior Notes Due 2019 [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
[1],[2] |
8.00%
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8.00%
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| Debt Instrument, Maturity Date |
[1],[2] |
Nov. 01, 2019
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Nov. 01, 2019
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| Thirteen and a Half Percent Senior Notes Due 2026 [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
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13.50%
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13.50%
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13.50%
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| Thirteen and a Half Percent Senior Notes Due 2026 [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
[1],[2] |
13.50%
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| Debt Instrument, Maturity Date |
[1],[2] |
Feb. 01, 2026
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| Five Percent Senior Notes due 2040 [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
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5.00%
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5.00%
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| Five Percent Senior Notes due 2040 [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
[1],[2] |
5.00%
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| Debt Instrument, Maturity Date |
[1],[2] |
Feb. 01, 2040
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| The 11.0% 2017 Amortizing Note [Member] | Senior Amortizing Notes [Member] |
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| Debt Instrument, Interest Rate, Stated Percentage |
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11.00%
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[1],[2] |
11.00%
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[1],[2] |
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11.00%
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| Debt Instrument, Maturity Date |
[1],[2] |
Dec. 01, 2017
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Dec. 01, 2017
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| Senior Exchangeable Notes Due 2017 [Member] | Senior Amortizing Notes [Member] |
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| Debt Instrument, Maturity Date |
[1],[2] |
Dec. 01, 2017
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Dec. 01, 2017
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| Senior Unsecured Term Loan Credit Facility Due 2027 [Member] | Senior Unsecured Term Loan Credit Facility [Member] |
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| Debt Instrument, Maturity Date |
[1],[2] |
Feb. 01, 2027
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