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Basis of Presentation and Nature of Operations - Narrative (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended
Aug. 31, 2014
Segment
acre
Aug. 31, 2013
Jun. 14, 2013
Rocketdyne Business [Member]
Jul. 31, 2012
Rocketdyne Business [Member]
Aug. 31, 2014
Rocketdyne Business [Member]
ExtensionPeriod
Jun. 14, 2013
Rocketdyne Business [Member]
Aug. 31, 2014
Sales Revenue, Net [Member]
Government Contracts Concentration Risk [Member]
Aug. 31, 2013
Sales Revenue, Net [Member]
Government Contracts Concentration Risk [Member]
Feb. 28, 2014
Aerojet Rocketdyne, Inc. [Member]
Feb. 28, 2013
Aerojet Rocketdyne, Inc. [Member]
Business Acquisition [Line Items]                    
Number of operating segments 2                  
Acres of land owned by the Company 11,900                  
Acquisition, purchase price       $ 550.0            
Aggregate consideration (0.2) 411.2 411.0              
Decrease in initial purchase price     55.0   55.0          
Expected future acquisition of ownership interest percentage         50.00% 50.00%        
Number of additional periods for termination extension date         4          
Agreement extension period         3 months          
Number of days required to provide notice period prior to termination date         5 days          
Extended purchase agreement term         3 months          
Number of weeks in first quarter                 91 days 98 days
Additional net sales due to additional week of operations                   $ 27.8
Percentage of Net Sales             85.00% 85.00%