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Stock Repurchase Plan
6 Months Ended
Jan. 31, 2012
Stock Repurchase Plan [Abstract]  
Stock Repurchase Plan
11. Stock Repurchase Plan

On March 9, 2006, the Company's Board of Directors approved the repurchase of up to 3,000,000 shares of common stock and on July 16, 2008 approved an increase of the Company's common stock repurchase authorization by an additional 3,000,000 shares. The Company did not repurchase any shares of common stock during the three months ended January 31, 2012. During the six months ended January 31, 2012, the Company repurchased 203,377 shares of common stock at a cost of approximately $7.9 million. Since inception of its stock repurchase plan through January 31, 2012, the Company has repurchased 4,468,181 shares at a cost of approximately $170.7 million. As of January 31, 2012, 1,531,819 shares remained available to repurchase under the existing repurchase authorization. Shares of common stock purchased pursuant to the repurchase program will be held as treasury shares and may be used for the issuance of shares under the Company's employee share award plans.