Stockholders' Equity - Share-Based Awards Available for Grant (Details) - shares	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares available for grant, beginning balance (in shares)	18,047,000	21,058,000	22,791,000
Shares available for grant under an assumed plan (in shares)	4,298,000
Restricted stock units granted (in shares)	(9,191,000)	(6,111,000)	(5,639,000)
Options granted (in shares)	(323,000)	(382,000)	(487,000)
Share-based awards canceled/forfeited/expired (in shares)	4,020,000	3,482,000	4,393,000
Shares available for grant, ending balance (in shares)	16,851,000	18,047,000	21,058,000
Pool shares reduced for each share granted (in shares)	2.3
Pool shares increased for each share forfeited (in shares)	2.3