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Significant Nonstrategic Timberland Transactions and Consolidation of Variable Interest Entities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2006
acre
Jan. 31, 2006
acre
May 23, 2005
acre
Mar. 28, 2005
acre
Oct. 31, 2012
Trading Company [Member]
Oct. 31, 2012
Asset Company [Member]
Oct. 31, 2012
General Textile [Member]
Oct. 31, 2012
STA Timber [Member]
Oct. 31, 2011
STA Timber [Member]
Oct. 31, 2010
STA Timber [Member]
May 31, 2005
STA Timber [Member]
Monetization Notes [Member]
Oct. 31, 2012
Flexible Packaging JV [Member]
Oct. 31, 2011
Flexible Packaging JV [Member]
Oct. 31, 2010
Flexible Packaging JV [Member]
Debt Instrument [Line Items]                                              
Approximate acres of timberland to be sold under agreement with Plum Creek Timberland                         56,000                    
Approximate value of sale agreement with Plum Creek Timberland                         $ 90                    
Acres of timberland sold under the agreement                   5,700 15,300 35,000                      
Value of timberland sold under the agreement                   9.7 29.3 51.0                      
Pretax gain resulting from sale under agreement                   9.0 27.4 42.1                      
Purchase notes payable                       50.9                      
Maximum amount of guarantee on purchase notes                       52.3                      
Senior secured notes                                       5.20%      
Maturity date                                       Aug. 05, 2020      
Extended date             Nov. 05, 2020                                
Debt instrument, principal outstanding                                 43.3 43.3   43.3      
Restricted bank financial instruments under buyer SPE             50.9 50.9                              
Interest income of Buyer SPE             2.4 2.4 2.4                            
Interest Expense 21.9 23.3 22.9 17.5 17.7 15.9 89.9 76.0 65.5               2.2 2.2 2.2        
Ownership percentage in Variable Interest Entity                           51.00% 49.00% 49.00%              
Committed capital contribution             150                                
Commitment to obtain third party financing             Up to $150 million                                
Outstanding advances to NSC             2.5 1.7                              
Short term loans payable to NSC             8.1                                
Net (income) loss attributable to the noncontrolling interest in the Flexible packaging JV $ (1.5) $ 0.2 $ (1.1) $ (2.4) $ (0.2) $ (0.2) $ 5.5 $ 2.9 $ 5.7                       $ 4.4 $ 3.5 $ 0.9