Common stock repurchases	6 Months Ended
Jan. 31, 2012
Common stock repurchases	16. Common stock repurchases: On December 9, 2010, the Company announced that its Board of Directors had authorized the repurchase of up to $30,000 of the Company’s common stock. The repurchase program was funded using the Company’s available cash. During the three and six months ended January 31, 2012, the Company 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, the Company ultimately repurchased and retired 586,679 shares of Common Stock for $30,000 at an average purchase price of $51.14 per share. On December 8, 2011, the Company announced that its Board of Directors had authorized the repurchase of up to an additional $30,000 of the Company’s common stock. The repurchase program will be funded using the Company’s available cash. During the three and six months ended January 31, 2012, the Company 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.

16. Common stock repurchases:

On December 9, 2010, the Company announced that its Board of Directors had authorized the repurchase of up to $30,000 of the Company’s common stock. The repurchase program was funded using the Company’s available cash. During the three and six months ended January 31, 2012, the Company 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, the Company ultimately repurchased and retired 586,679 shares of Common Stock for $30,000 at an average purchase price of $51.14 per share.

On December 8, 2011, the Company announced that its Board of Directors had authorized the repurchase of up to an additional $30,000 of the Company’s common stock. The repurchase program will be funded using the Company’s available cash. During the three and six months ended January 31, 2012, the Company 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.