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Supplemental Disclosure of Cash Flow Information (Details Textual) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2018 | Apr. 30, 2019 | Feb. 01, 2018
Fair Value of Assets Acquired | $ 13 |  |
8.0% Senior Notes Due 2019 [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% | 8.00%
The 13.5% Senior Notes Due 2026 [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 13.50%
The 5.0% Senior Notes due 2040 [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.00%

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