Acquisition - Components of Estimated Purchase Price (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Jun. 14, 2013	Nov. 30, 2013
Business Acquisition [Line Items]
Total preliminary purchase price		$ 411.2
Rocketdyne Business [Member]
Business Acquisition [Line Items]
Purchase Price		495.0
Advance payments on contracts adjustment		(57.3)
Capital expenditures adjustment		(29.8)
Target net asset adjustment		3.3
Total preliminary purchase price	$ 411.2	$ 411.2