Cost Reduction Plan - Narrative (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	9 Months Ended
	Jan. 30, 2014 employee	Aug. 31, 2014	Feb. 28, 2014
Restructuring Cost and Reserve [Line Items]
Reduction in headcount of employees	260
Restructuring plan, liability		$ 0.6	$ 10.0
Restructuring plan, payments liability		0.4
Restructuring plan cost		6.1
Restructuring plan, savings factor		2
Rocketdyne Business [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring plan, payments liability		0.2
Other Noncurrent Assets [Member] | Rocketdyne Business [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring plan cost		$ 3.0