Commitments and Contingencies - Narrative - Environmental Matters (Detail) (USD $)			9 Months Ended				0 Months Ended					0 Months Ended	9 Months Ended		148 Months Ended					0 Months Ended	36 Months Ended	1 Months Ended		9 Months Ended	1 Months Ended		1 Months Ended		9 Months Ended
	Aug. 31, 2014	Nov. 30, 2013	Aug. 31, 2014 Various Environmental Matters [Member] LegalMatter	Aug. 31, 2014 Various Environmental Matters [Member] Minimum [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Maximum [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Contracting business [Member]	Mar. 14, 2008 Various Environmental Matters [Member] Sacramento, California [Member] acre	Aug. 31, 2014 Various Environmental Matters [Member] Sacramento, California [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Sacramento, California [Member] Scenario, Previously Reported [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Sacramento, California [Member] Minimum [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Sacramento, California [Member] Maximum [Member]	Sep. 20, 2011 Various Environmental Matters [Member] Sacramento, California [Member] Environmental Protection Agency [Member] unilateral_administrative_order	Aug. 31, 2014 Various Environmental Matters [Member] Sacramento, California [Member] Environmental Protection Agency [Member] acre	Aug. 31, 2014 Various Environmental Matters [Member] Baldwin Park Operable Unit [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Baldwin Park Operable Unit [Member] respondent	Aug. 31, 2014 Various Environmental Matters [Member] Baldwin Park Operable Unit [Member] Minimum [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Baldwin Park Operable Unit [Member] Maximum [Member]	Mar. 28, 2014 Various Environmental Matters [Member] Baldwin Park Operable Unit [Member] Aerojet Rocketdyne, Inc. [Member]	Mar. 27, 2014 Various Environmental Matters [Member] Baldwin Park Operable Unit [Member] Aerojet Rocketdyne, Inc. [Member]	Jun. 30, 2000 Various Environmental Matters [Member] Baldwin Park Operable Unit [Member] Environmental Protection Agency [Member] respondent	Dec. 31, 1997 Various Environmental Matters [Member] Baldwin Park Operable Unit [Member] Environmental Protection Agency [Member] respondent	Aug. 31, 2013 Various Environmental Matters [Member] Toledo, Ohio [Member]	Aug. 31, 2007 Various Environmental Matters [Member] Toledo, Ohio [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Toledo, Ohio [Member]	Aug. 31, 2007 Various Environmental Matters [Member] Toledo, Ohio [Member] Minimum [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Toledo, Ohio [Member] Minimum [Member]	Aug. 31, 2007 Various Environmental Matters [Member] Toledo, Ohio [Member] Maximum [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Toledo, Ohio [Member] Maximum [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Wabash, Indiana [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Wabash, Indiana [Member] Minimum [Member]	Aug. 31, 2014 Various Environmental Matters [Member] Wabash, Indiana [Member] Maximum [Member]
Site Contingency [Line Items]
Number of environmental remediation matters			40
Environmental remediation term			15 years
Estimated environmental costs				$ 168,600,000	$ 276,100,000					$ 130,200,000	$ 211,700,000					$ 23,800,000	$ 35,700,000									$ 200,000		$ 500,000		$ 800,000	$ 1,200,000
Accrued environmental costs	168,600,000	171,300,000	168,600,000					130,200,000						23,800,000	23,800,000									200,000					800,000
Environmental obligation funding percent						96.00%
Guarantee obligations	120,000,000							75,000,000	20,000,000					25,000,000	25,000,000
Non-contaminated land							400						2,600
Number of Unilateral Administrative Orders												2
Management agreement terms														15 years
Percentage of responsibility in all project costs																		70.00%	68.00%
Number of other respondents															2					7	18
Reserve accrued														0	0
Total project cost to complete the project																									47,000,000		49,000,000
Project Funded by Great Lakes Legacy Act, Percent																							50.00%
Estimated project costs																									23,500,000		24,500,000
Environmental costs, increase in Company's share																						100,000
Expenditures recoverable																								$ 0					$ 0