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Subsequent Events	3 Months Ended
Subsequent Events	Oct. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 14, 2017, the Board of Directors declared a quarterly cash dividend to shareholders of the Company’s Class A and Class B Common Stock of $0.2075 per share payable on January 31, 2018, to shareholders of record at the close of business on January 10, 2018.