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Note 11 - Senior Secured, Senior, Senior Amortizing, and Senior Exchangeable Notes (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
May. 15, 2016
USD ($)
Jan. 15, 2016
USD ($)
Nov. 05, 2014
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Oct. 31, 2015
USD ($)
The 6.25% 2016 Notes [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member]              
Debt Instrument, Maturity Date       Jan. 15, 2016 Jan. 15, 2016   Jan. 15, 2016
Debt Instrument, Interest Rate, Stated Percentage   6.25%   6.25% 6.25%   6.25%
Repayments of Senior Debt   $ 172,700          
The 7.5% 2016 Notes [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member] | Subsequent Event [Member]              
Debt Instrument, Interest Rate, Stated Percentage 7.50%            
Repayments of Senior Debt $ 86,500            
The 7.5% 2016 Notes [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member]              
Debt Instrument, Maturity Date       May 15, 2016 May 15, 2016   May 15, 2016
Debt Instrument, Interest Rate, Stated Percentage       7.50% 7.50%   7.50%
The 8.625% 2017 Notes [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member]              
Debt Instrument, Maturity Date       Jan. 15, 2017 Jan. 15, 2017   Jan. 15, 2017
Debt Instrument, Interest Rate, Stated Percentage       8.625% 8.625%   8.625%
Long-term Debt, Gross       $ 121,000 $ 121,000    
The 5.0% 2021 Notes [Member] | Senior Secured Notes [Member]              
Debt Instrument, Maturity Date         Nov. 01, 2021   Nov. 01, 2021
Debt Instrument, Interest Rate, Stated Percentage       5.00% 5.00%   5.00%
The 2.0% 2021 Notes [Member] | Senior Secured Notes [Member]              
Debt Instrument, Maturity Date         Nov. 01, 2021   Nov. 01, 2020
Debt Instrument, Interest Rate, Stated Percentage       2.00% 2.00%   2.00%
The 7.25% 2020 Notes [Member] | Senior Secured Notes [Member]              
Debt Instrument, Maturity Date         Oct. 15, 2020   Oct. 15, 2020
Debt Instrument, Interest Rate, Stated Percentage       7.25% 7.25%   7.25%
The 9.125% 2020 Notes [Member] | Senior Secured Notes [Member]              
Debt Instrument, Maturity Date         Nov. 15, 2020   Nov. 15, 2020
Debt Instrument, Interest Rate, Stated Percentage       9.125% 9.125%   9.125%
The 7.25% 2020 Notes and 9.125% 2020 Notes [Member] | Senior Secured Notes [Member] | Restricted Cash [Member] | Letter of Credit [Member]              
Cash Collateral for Borrowed Securities       $ 2,300 $ 2,300   $ 2,600
The 7.25% 2020 Notes and 9.125% 2020 Notes [Member] | Senior Secured Notes [Member]              
Debt Instrument, Collateral Amount       685,100 685,100    
Cash Collateral for Borrowed Securities       106,400 106,400    
The 2.0% 2021 Notes Member and 5.0% 2021 Notes [Member] | Senior Secured Notes [Member] | Cash and Cash Equivalents Collateral [Member]              
Debt Instrument, Collateral Amount       16,500 16,500    
The 2.0% 2021 Notes Member and 5.0% 2021 Notes [Member] | Senior Secured Notes [Member] | Secured Group [Member]              
Debt Instrument, Collateral Amount       153,900 153,900    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures       $ 66,300 $ 66,300    
8.0% Senior Notes Due 2019 [Member]              
Debt Instrument, Interest Rate, Stated Percentage     8.00% 8.00% 8.00%    
Debt Instrument, Face Amount     $ 250,000        
Proceeds from Issuance of Long-term Debt     $ 245,700        
Debt Instrument, Redemption Price, Percentage     100.00%        
Series A Preferred Stock [Member]              
Preferred Stock, Dividend Rate, Percentage       7.625%      
Debt Covenant Fixed Charge Coverage Ratio Minimum       2 2    
Debt Instrument, Redemption Price, Percentage     100.00%        
Repayments of Senior Debt         $ 175,040 $ 2,062