Acquisition - Substantial Expenses in Connection with Acquisition (Detail) (USD $) In Millions, unless otherwise specified	Nov. 30, 2013	Nov. 30, 2012
Business Acquisition [Line Items]
Total expenses related to Acquisition	$ 20.0	$ 11.6
Rocketdyne Business [Member]
Business Acquisition [Line Items]
Total expenses related to Acquisition	31.6
Rocketdyne Business [Member] | LDACS [Member]
Business Acquisition [Line Items]
Total expenses related to Acquisition	1.7
Rocketdyne Business [Member] | Legal Expenses [Member]
Business Acquisition [Line Items]
Total expenses related to Acquisition	16.4
Rocketdyne Business [Member] | Professional Fees and Consulting [Member]
Business Acquisition [Line Items]
Total expenses related to Acquisition	8.9
Rocketdyne Business [Member] | Internal Labor [Member]
Business Acquisition [Line Items]
Total expenses related to Acquisition	3.4
Rocketdyne Business [Member] | Internal Labor [Member] | LDACS [Member]
Business Acquisition [Line Items]
Total expenses related to Acquisition	0.3
Rocketdyne Business [Member] | Other Expenses [Member]
Business Acquisition [Line Items]
Total expenses related to Acquisition	$ 1.2