Acquisition - Substantial Expenses in Connection with Acquisition (Parenthetical) (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
Internal Labor [Member] | Rocketdyne Business [Member]
Business Acquisition [Line Items]
Total expenses related to Acquisition	3.4
Internal Labor [Member] | Rocketdyne Business [Member] | LDACS [Member]
Business Acquisition [Line Items]
Total expenses related to Acquisition	$ 0.3