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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%

X

- 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.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The fair value of assets acquired in noncash investing or financing activities.

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