Acquisition - Summary of Pro Forma Information Related to Results of Operations (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Net sales:
As reported	$ 329.7	$ 243.7
Net (loss) income:
As reported	(2.1)	(14.0)
Rocketdyne Business [Member]
Net sales:
As reported	243.7
Pro forma	420.9
Net (loss) income:
As reported	(14.0)
Pro forma	$ 12.1
Basic (loss) income per share
As reported	$ (0.24)
Pro forma	$ 0.20
Diluted (loss) income per share
As reported	$ (0.24)
Pro forma	$ 0.17