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Shareholders' Equity	3 Months Ended
Shareholders' Equity	Oct. 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 three months ended October 31, 2018, the Company repurchased 1.6 million shares for $80.9 million. As of October 31, 2018, the Company had remaining authorization to repurchase 2.9 million shares under this plan. On November 30, 2018, the Company's Board of Directors declared a cash dividend in the amount of 19.0 cents per common share, payable December 21, 2018, to shareholders of record as of December 11, 2018.