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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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