Capital Stock (Details) $ / shares in Units, $ in Thousands	3 Months Ended	111 Months Ended
	Feb. 29, 2016 USD ($) $ / shares shares	Feb. 29, 2016 USD ($) shares
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during the period	$ 6,221
Class A Common Stock | Stock Purchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount under Stock Purchase Plan	$ 330,000	$ 330,000
Stock repurchased during the period (shares) | shares	184,300	7,248,262
Stock repurchased during the period	$ 6,200	$ 274,500
Weighted average price of stock repurchased (in US$ per share) | $ / shares	$ 33.74
Remaining repurchase authority under the Stock Purchase Plan	$ 55,500	$ 55,500