Stockholders' Equity - Share-Based Awards Available for Grant (Details) shares in Thousands	6 Months Ended
	Jan. 31, 2020 shares
Shares Available for Grant
Shares available for grant, beginning balance (in shares)	21,058
Restricted stock units granted (in shares)	(855)
Options granted (in shares)	0
Share-based awards canceled/forfeited/expired (in shares)	1,823
Shares available for grant, ending balance (in shares)	22,026
Pool shares reduced for each share granted (in shares)	2.3
Pool shares increased for each share forfeited (in shares)	2.3