Cost Reduction Plan - Narrative (Details) $ in Millions		3 Months Ended			12 Months Ended
	Jan. 30, 2014 employee	Aug. 31, 2015 USD ($)	May. 31, 2015 USD ($) employee	Nov. 30, 2014 USD ($) employee	Nov. 30, 2015 USD ($)	Feb. 28, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Reduction in headcount of employees | employee	260		500	90
Restructuring plan, liability				$ 4.3		$ 10.0
Restructuring plan cost				6.3
Reduction in restructuring plan liability		$ 1.5	$ 5.1
Period estimated to incur restructuring and related costs					4 years
Estimated restructuring and related costs over next four years			$ 110.0
Non-cash accelerated depreciation expense due to CIP					$ 0.8
Postemployment benefits liability		$ 2.6
Other Noncurrent Assets [Member] | Rocketdyne Business [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring plan cost				$ 3.0