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Note 13 (Detail) (USD $)
3 Months Ended 0 Months Ended 0 Months Ended
Jan. 31, 2013
Oct. 02, 2012
Initial [Member]
Senior Exchangeable Notes [Member]
The 6.00% Exchangable Note Units [Member]
Oct. 02, 2012
Initial [Member]
Senior Amortizing Notes [Member]
The 6.00% Exchangable Note Units [Member]
Apr. 30, 2013
Initial [Member]
Oct. 02, 2012
Additional [Member]
Senior Amortizing Notes [Member]
The 6.00% Exchangable Note Units [Member]
Apr. 30, 2013
Additional [Member]
Oct. 02, 2012
Per Annum [Member]
Senior Amortizing Notes [Member]
The 6.00% Exchangable Note Units [Member]
Oct. 02, 2012
Senior Exchangeable Notes [Member]
The 6.00% Exchangable Note Units [Member]
Apr. 30, 2013
Senior Exchangeable Notes [Member]
Oct. 02, 2012
Senior Amortizing Notes [Member]
The 6.00% Exchangable Note Units [Member]
Apr. 30, 2013
The 6.00% Exchangable Note Units [Member]
Oct. 02, 2012
The 6.00% Exchangable Note Units [Member]
Debt Instrument, Face Amount (in Dollars)       $ 992,000,000   $ 460,600,000           $ 100,000,000
Debt Instrument, Interest Rate, Stated Percentage     11.00%       11.00%       6.00% 6.00%
Note Units Number                       100,000
Note Units Stated Amount (in Dollars per Item)                       1,000
Number of Coupons   0                    
Note Units Initial Principal Amount Exchangeable Note (in Dollars per Item)   768.51                    
Note Units Principal Amount At Maturity (in Dollars per Item)   1,000                    
Note Units Initial Principal Amount Senior Amortizing Note (in Dollars per Item)     231.49                  
Debt Instrument, Interest Rate, Effective Percentage               5.17%        
Convertible Debt Shares Issued Upon Conversion (in Dollars per Item)               185.5288        
Share Price For Exchangeable Note Conversion (in Dollars per Item)               5.39        
Debt Instrument, Periodic Payment, Interest (in Dollars)         $ 39.83         $ 30.00    
Senior exchangeable notes exchanged for Class A Common Stock (in Shares) 18,305               18,300,000      
Stock Issued During Period, Shares, Conversion of Convertible Securities (in Shares) 3,396,102