Stockholders' Equity - Share-Based Awards Available for Grant (Details) shares in Thousands	3 Months Ended
	Oct. 31, 2019 shares
Shares Available for Grant
Shares available for grant, beginning balance (in shares)	21,058
Options granted (in shares)	0
Restricted stock units granted (in shares)	(524)
Share-based awards canceled/forfeited/expired (in shares)	1,313
Shares available for grant, ending balance (in shares)	21,847
Pool shares reduced for each share granted (in shares)	2.3
Pool shares increased for each share forfeited (in shares)	2.3