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Long-Term Debt - Narrative - Senior Debt (Details) - USD ($)
12 Months Ended
May. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Debt Instrument [Line Items]      
Outstanding under term loan facility   $ 93,800,000 $ 98,800,000
Term Loan Due May 2019 [Member]      
Debt Instrument [Line Items]      
Outstanding under term loan facility   93,800,000 $ 98,800,000
Senior Credit Facility [Member]      
Debt Instrument [Line Items]      
Percentage of equity interests owned or held by the loan parties 65.00%    
Percentage of non-voting stock owned or held by the loan parties 100.00%    
Outstanding letters of credit   $ 44,100,000  
Interest rate addition to base rate   2.50%  
Senior Credit Facility [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Interest coverage ratio   2.40  
Senior Credit Facility [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Revolving loan facilities to finance leveraged buyout   $ 150,000,000.0  
Senior Credit Facility [Member] | Maximum [Member] | Till November 30, 2015 [Member]      
Debt Instrument [Line Items]      
Leverage ratio   4.50  
Senior Credit Facility [Member] | Maximum [Member] | Till November 30, 2017 [Member]      
Debt Instrument [Line Items]      
Leverage ratio   4.25  
Senior Credit Facility [Member] | Maximum [Member] | Thereafter [Member]      
Debt Instrument [Line Items]      
Leverage ratio   4.00  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Commitment fee basis points   0.50%  
Interest at LIBOR plus basis points   2.50%  
Debt instrument, fronting fee per annum, basis points   0.25%  
Aerojet Rocketdyne, Aerojet Rocket of DE, Inc., Arde and Arde-Barinco [Member] | Third Amendment [Member] | Senior Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving credit facility aggregate principal amount $ 200,000,000.0    
Standby letters of credit 100,000,000.0    
Swingline loans 5,000,000.0    
Term loan facility principal amount $ 100,000,000.0    
Aerojet Rocketdyne, Aerojet Rocket of DE, Inc., Arde and Arde-Barinco [Member] | Third Amendment [Member] | Senior Credit Facility [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Term loan facility amortize percentage 5.00%