Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	May 31, 2013	May 31, 2013	May 31, 2012
Income Taxes [Line Items]
Liability for uncertain tax positions, inclusive of tax, interest, and penalties	$ 2.4	$ 2.4
If the accrued liability for uncertain tax positions was de-recognized, the amount that would reduce the effective tax rate	1.3	1.3
Tax deductions with uncertain timing	0.7	0.7
If the tax benefits with uncertain timing were de-recognized, effect on effective income tax rate	0	0
Accrued interest related to uncertain tax positions	0.5	0.5
Accrued penalties related to uncertain tax positions	0	0
If the accrued interest and penalties related to uncertain tax positions were de-recognized, amount that would reduce effective tax rate	0.3	0.3
Effective Income Tax Rate Approximated Statutory Rate, Continuing Operations	39.30%
Effective Income Tax Rate, Continuing Operations	38.40%	38.70%	37.60%
State
Income Taxes [Line Items]
Liability for uncertain tax positions, inclusive of tax, interest, and penalties	$ 1.9	$ 1.9