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Supplemental Disclosure of Noncash Investing and Financing Activities (Details Textual) - USD ($) $ in Millions | 6 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2021 | Oct. 31, 2022 | Aug. 02, 2021 | Oct. 31, 2020 | Apr. 30, 2020 | Mar. 25, 2020 | Jan. 31, 2020 | Dec. 10, 2019 | Oct. 31, 2019
The 10.0% Senior Secured 1.75 Lien Notes due 2025 [Member] | Senior Secured Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 158.5 | $ 158.5 |
Debt Instrument, Interest Rate, Stated Percentage | 10.00% | 10.00% |  |  |  |  | 10.00% | 10.00% |
The 10.0% 2022 Notes [Member] | Senior Secured Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 10.00% |  |  | 10.00% | 10.00% |  | 10.00% |  |
Debt Instrument Exchanged, Face Amount |  |  |  |  |  |  | $ 23.2 |  |
Debt Instrument, Exchange, Amount Issued |  |  |  |  | $ 59.1 |  |  |  |
The 10.5% 2024 Notes [Member] | Senior Secured Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 10.50% | 10.50% |  |  |  |  |
Debt Instrument Exchanged, Face Amount |  |  |  |  |  |  | 141.7 |  |
Senior Unsecured Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument Exchanged, Face Amount |  |  |  |  |  |  | 163.0 | $ 163.0 |
The 10.0% Senior Secured 1.75 Lien Term Loans Due 2028 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 81.5 | $ 81.5 |
The 11.25% Senior Secured 1.5 Lien Notes due February 15, 2026 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 11.25% |  |  |  | 11.25%
Debt Instrument, Exchange, Amount Issued |  |  |  |  | $ 59.1 | $ 59.1 |  |  |
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% | 11.25% |  |  |  |  |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  | 23.3 |  |
Operating Lease, Liability, Total |  |  |  |  |  |  | $ 24.4 |  |
Acquisition of Remaining Assets of One of Joint Ventures [Member] |  |  |  |  |  |  |  |  |
Reduction in Investment from Purchase of Remining Interest in Joint Venture | $ 26.6 |  |  |  |  |  |  |  |

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