Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Feb. 28, 2013
Income Taxes [Line Items]
Liability for uncertain tax positions, inclusive of tax, interest, and penalties	$ 2.3
If the accrued liability for uncertain tax positions was de-recognized, the amount that would reduce the effective tax rate	1.2
Tax deductions with uncertain timing	0.7
If the tax benefits with uncertain timing were de-recognized, effect on effective income tax rate	0
Accrued interest related to uncertain tax positions	0.4
Accrued penalties related to uncertain tax positions	0
If the accrued interest and penalties related to uncertain tax positions were de-recognized, amount that would reduce effective tax rate	0.3
Effective Income Tax Rate, Continuing Operations	36.10%
State
Income Taxes [Line Items]
Liability for uncertain tax positions, inclusive of tax, interest, and penalties	$ 1.9