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Shareholders' Equity
 9 Months Ended
Oct. 31, 2011
Shareholders' Equity [Abstract]  
Shareholders' Equity

8. Shareholders' Equity

On February 28, 2006, the Company's Board of Directors approved a stock repurchase program which authorized the Company to repurchase up to 8,000,000 common shares. On November 16, 2010 and August 25, 2011, the Company's Board of Directors approved two separate stock repurchase authorizations of 10,000,000 additional common shares. These additional authorizations supplemented the Company's 2006 stock repurchase program.

During the three and nine months ended October 31, 2011, the Company repurchased and subsequently retired 13,326,354 common shares at a total cost of $322,318 and 20,491,530 common shares at a total cost of $538,311, respectively. The average cost per share of the repurchases for the three and nine months ended October 31, 2011 was $24.19 and $26.27, respectively, including commissions. During the three and nine months ended October 31, 2010, the Company repurchased and subsequently retired 4,273,267 common shares at a total cost of $132,735 and 6,288,447 common shares at a total cost of $200,737, respectively. The average cost per share of the repurchases for the three and nine months ended October 31, 2010 was $31.06 and $31.92, respectively, including commissions. During the nine months ended October 31, 2010, the Company repurchased and subsequently retired 112,770 common shares for $3,986 from an employee to meet a minimum statutory tax withholding requirement. As of October 31, 2011, there were no common shares available for repurchase under the program.

As a result of the share repurchase activity noted above, the Company reduced the balance of additional paid-in-capital to zero. Subsequent share repurchase activity was recorded as a reduction of retained earnings. During the nine months ended October 31, 2011, the Company reduced retained earnings by $498,339, related to these share repurchases.