Common Stock Repurchases	6 Months Ended
Jan. 31, 2013
Common Stock Repurchases	13. Common stock repurchases: On December 9, 2010, we announced that our Board of Directors authorized the repurchase of up to $30,000 of our common stock. The repurchase program was funded using our available cash. During the three and six months ended January 31, 2012, we repurchased and retired 54,690 and 286,390 shares of common stock, respectively, under this repurchase program for $3,005 and $14,813, respectively, at an average purchase price of $54.95 and $51.73 per share, respectively. Upon completion of the program in the second quarter of fiscal year 2012, we ultimately repurchased and retired a total of 586,679 shares of common stock for $30,000 at an average purchase price of $51.14 per share. On December 8, 2011, we announced that our Board of Directors had authorized the repurchase of up to an additional $30,000 of our common stock. The repurchase program will be funded using our available cash. During the three and six months ended January 31, 2013, we repurchased and retired 29,003 and 85,327 shares of common stock, respectively, under this repurchase program for $2,087 and $6,024, respectively, at an average purchase price of $71.91 and $70.56 per share, respectively. During the three and six months ended January 31, 2012, we repurchased and retired 14,732 shares of common stock under this repurchase program for $799 at an average purchase price of $54.25 per share. As of January 31, 2013, we repurchased and retired a total of 222,918 shares of common stock under this repurchase program for $14,468 at an average purchase price of $64.90 per share.

13. Common stock repurchases:

On December 9, 2010, we announced that our Board of Directors authorized the repurchase of up to $30,000 of our common stock. The repurchase program was funded using our available cash. During the three and six months ended January 31, 2012, we repurchased and retired 54,690 and 286,390 shares of common stock, respectively, under this repurchase program for $3,005 and $14,813, respectively, at an average purchase price of $54.95 and $51.73 per share, respectively. Upon completion of the program in the second quarter of fiscal year 2012, we ultimately repurchased and retired a total of 586,679 shares of common stock for $30,000 at an average purchase price of $51.14 per share.

On December 8, 2011, we announced that our Board of Directors had authorized the repurchase of up to an additional $30,000 of our common stock. The repurchase program will be funded using our available cash. During the three and six months ended January 31, 2013, we repurchased and retired 29,003 and 85,327 shares of common stock, respectively, under this repurchase program for $2,087 and $6,024, respectively, at an average purchase price of $71.91 and $70.56 per share, respectively. During the three and six months ended January 31, 2012, we repurchased and retired 14,732 shares of common stock under this repurchase program for $799 at an average purchase price of $54.25 per share. As of January 31, 2013, we repurchased and retired a total of 222,918 shares of common stock under this repurchase program for $14,468 at an average purchase price of $64.90 per share.