Stockholders' Equity - Share-Based Awards Available for Grant (Details)		6 Months Ended
	Jan. 20, 2022 shares	Jan. 31, 2022 shares
Shares Available for Grant
Shares available for grant, beginning balance		16,851,000
Additional shares authorized		19,903,000
Restricted stock units granted		(3,128,000)
Options granted		0
Share-based awards canceled/forfeited/expired		2,297,000
Shares available for grant, ending balance		35,923,000
Pool shares reduced for each share granted		2.3
Pool shares increased for each share forfeited		2.3
Additional shares authorized		19,903,000
Amended and Restated 2005 Equity Incentive Plan
Shares Available for Grant
Additional shares authorized	18,000,000
Additional shares authorized	18,000,000
Shares Previously Available Under Credit Karma Plan
Shares Available for Grant
Additional shares authorized	1,902,811
Additional shares authorized	1,902,811