Note 11 - Senior Secured, Senior, Senior Amortizing, and Senior Exchangeable Notes (Details) - Senior Secured, Senior and Senior Subordinated Notes (Parentheticals)	3 Months Ended	9 Months Ended	12 Months Ended
	Jan. 31, 2016	Jul. 31, 2015	Oct. 31, 2015	Jan. 15, 2016	Oct. 02, 2012
Senior Amortizing Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	11.00%
The 7.25% 2020 Notes [Member] | Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	7.25%		7.25%
Debt Instrument, Maturity Date	Oct. 15, 2020		Oct. 15, 2020
The 9.125% 2020 Notes [Member] | Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	9.125%		9.125%
Debt Instrument, Maturity Date	Nov. 15, 2020		Nov. 15, 2020
The 2.0% 2021 Notes [Member] | Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	2.00%		2.00%
Debt Instrument, Maturity Date	Nov. 01, 2021		Nov. 01, 2021
The 5.0% 2021 Notes [Member] | Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	5.00%		5.00%
Debt Instrument, Maturity Date	Nov. 01, 2021		Nov. 01, 2021
The 6.25% 2016 Notes [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes And Senior Exchangeable Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	6.25%		6.25%	6.25%
Debt Instrument, Maturity Date	Jan. 15, 2016	Jan. 15, 2016	Jan. 15, 2016
The 7.5% 2016 Notes [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes And Senior Exchangeable Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	7.50%		7.50%
Debt Instrument, Maturity Date	May 15, 2016		May 15, 2016
The 8.625% 2017 Notes [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes And Senior Exchangeable Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	8.625%		8.625%
Debt Instrument, Maturity Date	Jan. 15, 2017		Jan. 15, 2017
The 7.0% 2019 Notes [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes And Senior Exchangeable Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	7.00%		7.00%
Debt Instrument, Maturity Date	Jan. 15, 2019		Jan. 15, 2019
8.0% Senior Notes Due 2019 [Member] | Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	8.00%
8.0% Senior Notes Due 2019 [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes And Senior Exchangeable Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	8.00%		8.00%
Debt Instrument, Maturity Date	Nov. 01, 2019		Nov. 01, 2019
The 11.0% 2017 Amortizing Note [Member] | Senior Amortizing Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Stated Interest Rate	11.00%		11.00%		11.00%
Debt Instrument, Maturity Date	Dec. 01, 2017		Dec. 01, 2017
Senior Exchangeable Notes Due 2017 [Member] | Senior Amortizing Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 01, 2017		Dec. 01, 2017