Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended
	Feb. 28, 2013	Nov. 30, 2012	Feb. 29, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2013
Income Taxes [Line Items]
Income tax expense	$ 0.6	$ 0.6	$ 3.5	$ 3.5
Effective income tax rate, continuing operations					75.00%
Unrecognized tax benefits excluding interest and penalties			4.3
Unrecognized tax benefits, penalties and interest recognized		1.1			1.1
Unrecognized tax benefits that would impact effective tax rate						1.3
Domestic federal net operating loss carryforwards (NOLCs)	116.8
State and local net operating loss carryforwards (NOLCs)	90.0
Foreign tax credit carryforwards	0.6
AMT credit carryforwards	0.2
Domestic Capital Loss Carryforward	19.6
Domestic Capital Loss Carryforward, expiration year	2017
Minimum
Income Taxes [Line Items]
Net operating loss carryforwards (NOLCs), expiration year	2022
Open tax year, Internal Revenue Service and various states and foreign taxing jurisdictions	2007
Maximum
Income Taxes [Line Items]
Net operating loss carryforwards (NOLCs), expiration year	2032
Foreign tax credit carryforward, expiration year	2021
Scenario, Forecast
Income Taxes [Line Items]
Unrecognized tax benefits, reductions resulting from lapse of open statute of limitations					$ 3.3