Capital Stock	6 Months Ended
May 31, 2011
Capital Stock [Abstract]
Capital Stock	8. Capital Stock Stock Purchase Plan The Company has a share repurchase program (“Stock Purchase Plan”) under which it is authorized to purchase up to $250.0 million of its outstanding Class A common shares. The timing and amount of any shares repurchased under the Stock Purchase Plan will depend on a variety of factors, including price, corporate and regulatory requirements, capital availability and other market conditions. The Stock Purchase Plan may be suspended or discontinued at any time without prior notice. No shares have been or will be knowingly purchased from Company insiders or their affiliates. Since inception of the Stock Purchase Plan through May 31, 2011, the Company has purchased 5,630,481 shares of its Class A common shares, for a total of approximately $232.8 million. Included in these totals are the purchases of 407,868 shares of its Class A common shares during the six months ended May 31, 2011, at an average cost of approximately $29.41 per share (including commissions), for a total of approximately $12.0 million. These transactions occurred in open market purchases and pursuant to a trading plan under Rule 10b5-1. At May 31, 2011, the Company has approximately $17.2 million remaining repurchase authority under the current Stock Purchase Plan.

Capital Stock

6 Months Ended

May 31, 2011

8. Capital Stock

Stock Purchase Plan

The Company has a share repurchase program (“Stock Purchase Plan”) under which it is authorized to purchase up to $250.0 million of its outstanding Class A common shares. The timing and amount of any shares repurchased under the Stock Purchase Plan will depend on a variety of factors, including price, corporate and regulatory requirements, capital availability and other market conditions. The Stock Purchase Plan may be suspended or discontinued at any time without prior notice. No shares have been or will be knowingly purchased from Company insiders or their affiliates.

Since inception of the Stock Purchase Plan through May 31, 2011, the Company has purchased 5,630,481 shares of its Class A common shares, for a total of approximately $232.8 million. Included in these totals are the purchases of 407,868 shares of its Class A common shares during the six months ended May 31, 2011, at an average cost of approximately $29.41 per share (including commissions), for a total of approximately $12.0 million. These transactions occurred in open market purchases and pursuant to a trading plan under Rule 10b5-1. At May 31, 2011, the Company has approximately $17.2 million remaining repurchase authority under the current Stock Purchase Plan.