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Stock Repurchase Plan	12 Months Ended
Stock Repurchase Plan	Jul. 31, 2017
Payments for Repurchase of Equity [Abstract]
Stock Repurchase Plan	Share Repurchase Program On March 9, 2006, the Company’s Board of Directors approved a share repurchase program, authorizing the Company to repurchase up to 3,000,000 shares of common stock. On July 16, 2008, the Company’s Board of Directors increased the authorization by an additional 3,000,000 shares, and on December 4, 2015, the Company’s Board of Directors increased the authorization by an additional 1,500,000 shares for a total authorization to repurchase shares of up to 7,500,000 shares. During the year ended July 31, 2017, the Company repurchased 1,317 shares (at a total cost of $0.2 million). During the year ended July 31, 2016, the Company repurchased 485,866 shares (at a total cost of $53.8 million).The Company did not repurchase any shares of common stock during the year ended July 31, 2015. Since inception of this stock repurchase program through July 31, 2017, the Company has repurchased 5,436,294 shares at a cost of approximately $247.2 million. As of July 31, 2017, 2,063,706 shares remained available to repurchase under the existing repurchase authorization. These authorizations have no expiration date. Shares of common stock purchased pursuant to the repurchase program will be held as treasury shares and may be used for issuance under the Company’s employee share award plan.