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Shareholders' Equity	6 Months Ended
Shareholders' Equity	Jan. 31, 2018
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders' Equity The Company’s Board of Directors authorized the repurchase of up to 14.0 million shares of common stock under the Company's stock repurchase plan. This repurchase authorization is effective until terminated by the Board of Directors. During the six months ended January 31, 2018, the Company repurchased 1.3 million shares for $62.9 million. As of January 31, 2018, the Company had remaining authorization to repurchase 5.8 million shares under this plan. On January 26, 2018, the Company's Board of Directors declared a cash dividend in the amount of 18.0 cents per common share, payable March 6, 2018, to shareholders of record as of February 14, 2018.