Capital Stock (Details) - USD ($)	9 Months Ended		141 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during the period	$ 7,340,000
Dividends per share (in dollars per share)	$ 0.47	$ 0.43
Total dividend approved	$ 20,738,000
Class A Common Stock | Stock Purchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount under Stock Purchase Plan	$ 530,000,000		$ 530,000,000
Stock repurchased during the period (shares)	177,899		9,879,300
Average repurchase price (in dolllars per share)	$ 41.26
Stock repurchased during the period	$ 7,300,000		$ 365,800,000
Remaining repurchase authority under the Stock Purchase Plan	$ 164,200,000		$ 164,200,000