Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Additional paid-in capital	Additional paid-in capital Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive income (loss)	Accumulated other comprehensive income (loss) Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Common stock Common stock
Balance (in shares) at Jul. 31, 2017									75,007,625,000
Balance, beginning at Jul. 31, 2017	$ 888,530		$ 828,415		$ (5,796)		$ 65,903		$ 8
Balance, beginning (Accounting Standards Update 2016-09) at Jul. 31, 2017		$ 86,825		$ 1,009				$ 85,816
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (26,743)						(26,743)
Issuance of common stock upon exercise of stock options (in shares)	150,924								150,924,000
Issuance of common stock upon exercise of stock options	$ 2,013		2,013
Issuance of common stock upon RSU release (in shares)									1,255,605,000
Issuance of common stock for Cyence acquisition (in shares)									1,568,973,000
Issuance of common stock for Cyence acquisition	117,457		117,457
Public offering, net of issuance cost (in shares)									2,628,571,000
Public offering, net of issuance cost	220,948		220,948
Equity component of convertible senior notes, net of issuance cost	74,562		74,562
Purchase of capped calls	(37,200)		(37,200)
Stock-based compensation	89,176		89,176
Foreign currency translation adjustment	(1,567)				(1,567)
Unrealized gain (loss) on available-for-sale securities	(363)				(363)
Reclassification adjustment for realized gain on available-for-sale securities, included in net income	(22)				(22)
Balance (in shares) at Jul. 31, 2018									80,611,698,000
Balance, ending at Jul. 31, 2018	1,413,616		1,296,380		(7,748)		124,976		$ 8
Balance, ending (Accounting Standards Update 2014-09) at Jul. 31, 2018		44,339						44,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 20,732						20,732
Issuance of common stock upon exercise of stock options (in shares)	301,901								301,901,000
Issuance of common stock upon exercise of stock options	$ 3,954		3,954
Issuance of common stock upon RSU release (in shares)									1,276,252,000
Issuance of common stock upon restricted stock units ("RSU") release	0
Stock-based compensation	91,570		91,570
Foreign currency translation adjustment	(1,841)				(1,841)
Unrealized gain (loss) on available-for-sale securities	2,383				2,383
Reclassification adjustment for realized gain on available-for-sale securities, included in net income	(552)				(552)
Cancellation of Common Stock for Cyence acquisition (in shares)									(48,968,000)
Balance (in shares) at Jul. 31, 2019									82,140,883,000
Balance, ending at Jul. 31, 2019	1,574,201		1,391,904		(7,758)		190,047		$ 8
Balance, ending (Accounting Standards Update 2018-02) at Jul. 31, 2019		$ 0				$ (107)		$ 107
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (27,198)						(27,198)
Issuance of common stock upon exercise of stock options (in shares)	132,573								132,573,000
Issuance of common stock upon exercise of stock options	$ 4,955		4,955
Issuance of common stock upon RSU release (in shares)									1,188,469,000
Issuance of common stock upon restricted stock units ("RSU") release	0
Stock-based compensation	102,191		102,191
Foreign currency translation adjustment	518				518
Unrealized gain (loss) on available-for-sale securities	1,469				1,469
Reclassification adjustment for realized gain on available-for-sale securities, included in net income	632				632
Balance (in shares) at Jul. 31, 2020									83,461,925,000
Balance, ending at Jul. 31, 2020	$ 1,656,768		$ 1,499,050		$ (5,246)		$ 162,956		$ 8