Acquisition - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Millions, unless otherwise specified	Aug. 31, 2014	Nov. 30, 2013	Jun. 14, 2013 Rocketdyne Business [Member]
Business Acquisition [Line Items]
Current assets			$ 105.0
Property, plant and equipment, net			203.8
Other non-current assets			4.2
Total tangible assets acquired			313.0
Intangible assets acquired			128.3
Deferred income taxes			12.9
Total assets acquired			454.2
Liabilities assumed, current			(105.5)
Liabilities assumed, non-current			(7.2)
Total identifiable net assets acquired			341.5
Goodwill (Cash payment less total identifiable net assets acquired)	$ 164.4	$ 159.6	$ 69.5