Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Income Taxes And Tax Related [Line Items]
Effective tax rate	740.10%
Pre-tax losses	$ 26.2
Statutory federal income tax rate	(35.00%)	35.00%	35.00%
Valuation allowance	2.6	288.1
Income tax benefit, continuing operations	178.7
Income tax benefit, discontinued operations	1.1	0.5
Other Comprehensive Income	102.6
Income tax (benefit) provision	(193.9)	18.9	6.1
Current federal income taxes		5.2	1.5
Current federal tax on earnings	(1.4)	10.9	2.0
Current change in the federal uncertain tax position reserve		2.7
Current state and local income tax (benefit) provision	1.0	3.8	4.2
Excess of deferred tax expense from goodwill amortization		4.2	0.1
True-up of interest accrual				0.3
Unrecognized tax benefits, effect in tax rate	5.6
Accrued interest and penalties related to uncertain tax positions	0.2
Reduction in unrecognized tax benefits and related interest	0.4
Additional reserves	1.6
Income tax benefit	179.8
Net change in deferred tax assets	12.9
Loss carryover in foreign jurisdictions	2.2
Research and development credit carryover	32.4	24.9
U.S. federal [Member]
Income Taxes And Tax Related [Line Items]
Net operating loss carryforwards	0.7
Capital loss carryforwards	1.6
State [Member]
Income Taxes And Tax Related [Line Items]
Net operating loss carryforwards	5.5
Capital loss carryforwards	0.9
Federal [Member]
Income Taxes And Tax Related [Line Items]
Alternative minimum tax credit	2.7
Research and development credit carryover	4.6
California Research and Development Credit [Member]
Income Taxes And Tax Related [Line Items]
Research and development credit carryover	0.2
Equity Based Compensation [Member]
Income Taxes And Tax Related [Line Items]
Current federal tax on earnings		$ 3.0	$ 0.2