Long-term Debt - Narrative - Senior Credit Facility (Details) - USD ($)		6 Months Ended
	May. 30, 2014	May. 31, 2015	Nov. 30, 2014
Debt Instrument [Line Items]
Total senior debt		$ 96,300,000	$ 98,800,000
Term Loan [Member]
Debt Instrument [Line Items]
Total senior debt		96,300,000	$ 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		$ 46,400,000
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%