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Long-term Debt - Narrative - Senior Credit Facility (Details)
3 Months Ended 4 Months Ended
May. 30, 2014
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 30, 2015
USD ($)
Debt Instrument [Line Items]          
Total senior debt   $ 90,600,000 $ 90,600,000 $ 91,800,000 $ 93,100,000
Term Loan Due Two Thousand Nineteen [Member]          
Debt Instrument [Line Items]          
Total senior debt   91,300,000 91,300,000 92,500,000  
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 $ 44,100,000 $ 44,100,000  
Interest rate addition to base rate   2.50% 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, 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%