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Retirement Benefits - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Nov. 30, 2013
Participant
Nov. 30, 2012
Nov. 30, 2011
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Defined benefit pension plan assets, total $ 1,258.4 $ 1,243.1  
Projected benefit obligations, total 1,538.6    
Unfunded pension obligation 261.7 454.5  
Percentage of unfunded pension benefit obligation for tax-qualified pension plan 91.00%    
Accumulated prepayment credits 30.6 32.5  
Participation in multi-employer plan 0.1    
Employer's matching contributions to 401(k) plan   10.8 9.9
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 obligations The Company assumed a 8.5% annual rate of increase for pre and post 65 participants in the per capita cost of covered healthcare claims with the rate decreasing over seven years until reaching 5.0%.    
Participants 65    
First 3% of Compensation Contributed [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Compensation contributed 100.00%    
Compensation contributed 3.00%    
Employer's matching contributions to 401(k) plan 14.7    
Next 3% of Compensation Contributed [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Compensation contributed 50.00%    
Compensation contributed 3.00%    
Rocketdyne Business [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Projected benefit obligations, total 5.3    
Pension liability $ 5.3