Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Nov. 30, 2013	Nov. 30, 2012
Deferred Tax Assets
Accrued estimated costs	$ 91.4	$ 68.1
Basis difference in assets and liabilities	23.0	30.1
Tax losses and credit carryforwards	32.4	24.9
Net cumulative defined benefit pension plan losses	107.4	175.5
Retiree medical and life insurance benefits	27.4	30.1
Valuation allowance	(2.6)	(288.1)
Total deferred tax assets	279.0	40.6
Deferred Tax Liabilities
U.S. federal effect of state deferred taxes	12.6	10.6
Revenue recognition differences	53.4	26.1
Basis differences in intangible assets	20.3	15.5
Total deferred tax liabilities	86.3	52.2
Total net deferred tax assets (liabilities)	$ 192.7	$ (11.6)