CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Statement of Stockholders' Equity [Abstract]
Dividends, per share (in dollars per share)	$ 420.00	$ 380.00	$ 420.00	$ 380.00