Stockholders' Equity - Share-based awards available for grant (Details) - shares		6 Months Ended	12 Months Ended
	Jan. 20, 2022	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares available for grant, beginning balance (in shares)			26,260,000	16,851,000	18,047,000
Shares available for grant under an assumed plan (in shares)					4,298,000
Additional shares authorized (in shares)				19,903,000
Restricted stock units granted (in shares)			(12,098,000)	(14,868,000)	(9,191,000)
Options granted (in shares)			(413,000)	(400,000)	(323,000)
Share-based awards canceled/forfeited/expired (in shares)			5,277,000	4,774,000	4,020,000
Shares available for grant, ending balance (in shares)		26,260,000	19,026,000	26,260,000	16,851,000
Pool shares reduced for each share granted (in shares)			2.3
Pool shares increased for each share forfeited (in shares)		2.3	2.3
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares available for grant, ending balance (in shares)			19,000,000
Stock Options | Restated 2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Pool shares reduced for each share granted (in shares)			1
Number of shares added back to plan when grants are forfeited (in shares)			1
Restricted Stock Units (RSUs) | Credit Karma Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Pool shares reduced for each share granted (in shares)	1
Number of shares added back to plan when grants are forfeited (in shares)	1