Unusual Items - Unusual Items Expense (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Unusual or Infrequent Item [Line Items]
Rocketdyne Business acquisition related costs	$ 1.2
Loss on bank amendment			1.3
Total unusual items	24.5	12.7	5.6
Aerospace and Defense [Member]
Unusual or Infrequent Item [Line Items]
(Gain) loss on legal matters and settlements	(1.0)	0.7	4.1
Rocketdyne Business acquisition related costs	2.6
Total unusual items	1.6	0.7	4.1
Corporate [Member]
Unusual or Infrequent Item [Line Items]
Rocketdyne Business acquisition related costs	17.4	11.6
Loss on debt repurchased	5.0	0.4	0.2
Loss on legal settlement	0.5
Loss on bank amendment			1.3
Total unusual items	$ 22.9	$ 12.0	$ 1.5