Capital Stock - Additional Information (Detail) (Class A Common Stock $.01 Par Value, Stock Repurchase Plan, USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Aug. 31, 2012
Class A Common Stock $.01 Par Value | Stock Repurchase Plan
Schedule of Capitalization, Equity [Line Items]
Stock Purchase Plan, authorized purchase amount	$ 330.0
Stock Purchase Plan, purchased shares to date	7,063,962
Stock Purchase Plan, purchased amount to date	268.3
Stock Purchase Plan, remaining repurchase authority	$ 61.7