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Note 11 (Detail) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Jul. 31, 2012
Apr. 30, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Oct. 31, 2011
Jul. 31, 2005
Series A Preferred Stock [Member]
Jul. 31, 2012
Series A Preferred Stock [Member]
Jul. 31, 2012
Initial [Member]
Jul. 31, 2012
Additional [Member]
Jul. 31, 2012
Real Estate [Member]
The 10.625% 2016 Notes [Member]
Jul. 31, 2012
Real Estate [Member]
Senior Notes [Member]
Jul. 31, 2012
Cash [Member]
The 10.625% 2016 Notes [Member]
Jul. 31, 2012
Cash [Member]
Guarantees [Member]
Jul. 31, 2012
Letters of Credit Collateral [Member]
Oct. 31, 2011
Letters of Credit Collateral [Member]
Jul. 31, 2012
From Note Exchange [Member]
Jul. 31, 2012
Notes Collateral [Member]
Jul. 31, 2012
Note Repurchases [Member]
The 6.25% 2016 Notes [Member]
Jul. 31, 2012
Note Repurchases [Member]
The 7.5% 2016 Notes [Member]
Jul. 31, 2012
Note Repurchases [Member]
The 8.625% 2017 Notes [Member]
Jul. 31, 2012
Note Repurchases [Member]
The 11.875% 2015 Notes [Member]
Jul. 31, 2012
Note Repurchases [Member]
The 11.875% 2015 Notes [Member]
Jul. 31, 2012
Note Repurchases [Member]
Jul. 31, 2012
Note Repurchases [Member]
Jul. 31, 2012
Bondholder Exchange [Member]
The 6.25% 2016 Notes [Member]
Jul. 31, 2012
Bondholder Exchange [Member]
The 6.25% 2016 Notes [Member]
Jul. 31, 2012
Bondholder Exchange [Member]
The 7.5% 2016 Notes [Member]
Jul. 31, 2012
Bondholder Exchange [Member]
The 7.5% 2016 Notes [Member]
Jul. 31, 2012
Bondholder Exchange [Member]
The 8.625% 2017 Notes [Member]
Jul. 31, 2012
Bondholder Exchange [Member]
The 8.625% 2017 Notes [Member]
Jul. 31, 2012
Bondholder Exchange [Member]
Jul. 31, 2012
Bondholder Exchange [Member]
Jul. 31, 2012
The 10.625% 2016 Notes [Member]
Jul. 31, 2012
The 2.0% 2021 Notes [Member]
Nov. 02, 2011
The 2.0% 2021 Notes [Member]
Jul. 31, 2012
The 5.0% 2021 Notes [Member]
Nov. 02, 2011
The 5.0% 2021 Notes [Member]
Jul. 31, 2012
The 6.5% 2014 Notes [Member]
Jul. 31, 2012
The 6.375% 2014 Notes [Member]
Jul. 31, 2012
The 6.25% 2015 Notes [Member]
Jul. 31, 2012
The 6.25% 2016 Notes [Member]
Jul. 31, 2012
The 7.5% 2016 Notes [Member]
Jul. 31, 2012
The 8.625% 2017 Notes [Member]
Jul. 31, 2012
The 11.875% 2015 Notes [Member]
Jul. 31, 2012
Tangible Equity Units [Member]
Nov. 02, 2011
Maturities Ranging from 2014 through 2017 [Member]
Debt Instrument, Face Amount                 $ 992,000,000 $ 460,600,000                                               $ 797,000,000 $ 53,200,000 $ 53,200,000 $ 141,800,000 $ 141,800,000 $ 36,700,000 $ 3,000,000 $ 21,400,000 $ 131,200,000 $ 86,500,000 $ 121,000,000 $ 60,800,000   $ 195,000,000
Secured Debt 967,900,000     967,900,000                                                                                      
Debt Instrument, Interest Rate, Stated Percentage                                                                   10.625% 2.00% 2.00% 5.00% 5.00% 6.50% 6.375% 6.25% 6.25% 7.50% 8.625% 11.875% 7.25%  
Senior Notes, Unsecured 458,607,000     458,607,000   802,862,000                                                                                  
Subordinated Debt (in Dollars) 7,004,000     7,004,000   13,323,000                                                                                  
Debt Collateral                     640,900,000 36,500,000 164,800,000 86,400,000                                                                  
Cash Collateral for Borrowed Securities                             32,800,000 57,700,000                                                              
Cash Paid in Debt Exchange                                 14,200,000                                                            
Interest Paid in Debt Exchange                                 3,300,000                                                            
Debt Issuance Cost                                 4,700,000                                                            
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 59,700,000     59,700,000   57,800,000                       46,400,000                                                          
Face Amount of Debt Repurchased (in Dollars)   75,400,000                                 21,000,000 61,100,000 37,400,000 2,000,000 2,000,000     7,800,000   4,000,000   9,200,000   21,000,000 33,200,000                 7,800,000 4,000,000 18,300,000      
Repayments of Notes Payable       11,179,000                                       1,500,000 72,200,000                                            
Gains (Losses) on Extinguishment of Debt (in Dollars) 6,230,000   (1,391,000) 57,966,000 (3,035,000)                       200,000             400,000 48,400,000             5,800,000 9,300,000                            
Stock Issued During Period, Shares, New Issues (in Shares)   25,000,000                                                                                          
Debt Conversion, Original Debt, Amount                                                   $ 7,800,000 $ 7,800,000 $ 4,000,000 $ 4,000,000 $ 9,200,000 $ 18,300,000                                
Fixed Charge Coverage Ratio, Numerator 2.0     2.0                                                                                      
Fixed Charge Coverage Ratio, Denominator 1.0     1.0                                                                                      
Preferred Stock, Dividend Rate, Percentage             7.625% 7.625%