Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 2.36	$ 2.12	$ 1.88