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Subsequent Events	3 Months Ended
Subsequent Events	Oct. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	NOTE 14 – Subsequent Events On November 24, 2015, the Company initiated a modified "Dutch Auction" tender offer, or tender offer, to purchase up to 7,317,073 shares of its common stock at a price not greater than $41.00 nor less than $38.00 per share. Assuming 7,317,073 shares are repurchased at the maximum price of $41.00 per share in the tender offer, the Company will repurchase a total of $300.0 million of its common stock in the tender offer. The Company's directors and executive officers are expressly prohibited from participating in the tender offer by the board of directors under the Company's Insider Trading Policy. The shares to be purchased as a result of the tender offer are not part of the Company's stock repurchase program.