Acquisition - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Millions, unless otherwise specified	Feb. 28, 2014	Nov. 30, 2013	Jun. 14, 2013 Rocketdyne Business [Member]
Business Acquisition [Line Items]
Current assets			$ 105.5
Property, plant and equipment, net			202.7
Other non-current assets			10.0
Total tangible assets acquired			318.2
Intangible assets acquired			128.3
Deferred income taxes			12.9
Total assets acquired			459.4
Liabilities assumed, current			(105.5)
Liabilities assumed, non-current			(7.2)
Total identifiable net assets acquired			346.7
Goodwill (Cash payment less total identifiable net assets acquired)	$ 159.4	$ 159.6	$ 64.5