Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Additional paid-in capital	Accumulated other comprehensive income (loss)	Retained Earnings	Common stock	Common stock Common stock
Balance (in shares) at Jul. 31, 2016						73,039,919,000
Balance, beginning at Jul. 31, 2016	$ 783,935	$ 742,690	$ (6,593)	$ 47,831		$ 7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	18,072			18,072
Stock-based compensation	$ 72,695	72,695
Issuance of common stock upon exercise of stock options (in shares)	594,936					594,936,000
Issuance of common stock upon exercise of stock options	$ 5,563	5,563
Issuance of common stock upon RSU release (in shares)						1,372,770,000
Issuance of common stock upon restricted stock units (RSU) release	0	(1)			$ 1
Foreign currency translation adjustment	1,179		1,179
Unrealized gain (loss) on available-for-sale securities	(231)		(231)
Reclassification adjustment for realized gain on available-for-sale securities, included in net income	(151)		(151)
Tax benefit from the exercise of stock options and vesting of RSUs	7,468	7,468
Balance (in shares) at Jul. 31, 2017						75,007,625,000
Balance, ending at Jul. 31, 2017	888,530	828,415	(5,796)	65,903		$ 8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other liabilities	41,553
Net income (loss)	(26,743)			(26,743)
Stock-based compensation	$ 89,176	89,176
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 upon restricted stock units (RSU) release	0
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)
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)
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other liabilities	32,358
Net income (loss)	20,732			20,732
Stock-based compensation	$ 91,570	91,570
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
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)
Cancellation of Common Stock for Cyence acquisition	0
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other liabilities	$ (9,628)