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Acquisition - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Millions, unless otherwise specified
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2011
Jun. 14, 2013
Rocketdyne Business [Member]
Business Acquisition [Line Items]        
Current assets       $ 105.3
Property, plant and equipment, net       202.7
Other non-current assets       10.0
Total tangible assets acquired       318.0
Intangible assets acquired       128.3
Deferred income taxes       12.9
Total assets acquired       459.2
Liabilities assumed, current       (105.5)
Liabilities assumed, non-current       (7.2)
Total identifiable net assets acquired       346.5
Goodwill $ 159.6 $ 94.9 $ 94.9 $ 64.7