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Subsequent Events Subsequent Events (Notes)	12 Months Ended
Subsequent Events Subsequent Events (Notes)	Jul. 31, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events On September 12, 2018, the Company announced an increase in the annual dividend to shareholders of the Company's Class A Common Stock, from $0.83 to $0.85 per share. A quarterly dividend of $0.2125 will be paid on October 31, 2018, to shareholders of record at the close of business on October 10, 2018. This dividend represents an increase of 2.4% and is the 33rd consecutive annual increase in dividends.