Capital Stock (Details)	3 Months Ended	123 Months Ended
	Feb. 28, 2017 USD ($) $ / shares shares	Feb. 28, 2017 USD ($) shares
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during the period	$ 3,014,000
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) | shares	80,900	8,802,973
Stock repurchased during the period	$ 3,000,000	$ 326,400,000
Weighted average price of stock repurchased (in US$ per share) | $ / shares	$ 37.23
Remaining repurchase authority under the Stock Purchase Plan	$ 203,600,000	$ 203,600,000