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Retirement Benefits - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Nov. 30, 2012
Participant
Jan. 30, 2011
Nov. 30, 2010
Nov. 30, 2011
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Defined benefit pension plan assets, total $ 1,243.1     $ 1,296.8
Projected benefit obligations, total 1,717.7      
Unfunded pension obligation 454.5      
Percentage of unfunded pension benefit obligation for tax-qualified pension plan 84.00%      
Accumulated prepayment credits 32.5     59.5
Employer's matching contributions to 401(k) Plan $ 10.8 $ 9.9 $ 3.7  
Difference between expected return and actual return on market-related value of assets which smoothes asset values (in years) 3 years      
Long term rate of return on plan assets 8.00%      
Defined benefit plan description used for computing benefit obligation The Company assumed a 8.75% annual rate of increase for pre and post 65 participants in the per capita cost of covered healthcare claims with the rate decreasing over eight years until reaching 5.0%.      
Participants 65