Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock Common stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Retained Earnings
Beginning balance (in shares) at Jul. 31, 2018		80,611,698
Beginning balance at Jul. 31, 2018	$ 1,413,616	$ 8	$ 1,296,380	$ (7,748)	$ 124,976
Net loss	6,309				6,309
Issuance of common stock upon exercise of stock options (in shares)		74,698
Issuance of common stock upon exercise of stock options	689		689
Issuance of common stock upon vesting of Restricted Stock Units (RSU) (in shares)		372,079
Issuance of common stock upon vesting of Restricted Stock Units (“RSUs”)	0
Stock-based compensation	23,210		23,210
Foreign currency translation adjustment	(812)			(812)
Unrealized gain (loss) on available-for-sale securities, net of tax	(153)			(153)
Cancellation of common stock issued as part of Cyence acquisition (in shares)		(48,968)
Cancellation of common stock issued as part of Cyence acquisition	0
Ending balance (in shares) at Oct. 31, 2018		81,009,507
Ending balance at Oct. 31, 2018	1,487,198	$ 8	1,320,279	(8,713)	175,624
Beginning balance (in shares) at Jul. 31, 2018		80,611,698
Beginning balance at Jul. 31, 2018	1,413,616	$ 8	1,296,380	(7,748)	124,976
Net loss	(2,273)				(2,273)
Reclassification adjustment for realized gain (loss) on available-for-sale securities, included in net income (loss)	(384)
Ending balance (in shares) at Apr. 30, 2019		81,793,479
Ending balance at Apr. 30, 2019	1,526,001	$ 8	1,366,899	(7,944)	167,038
Beginning balance (in shares) at Oct. 31, 2018		81,009,507
Beginning balance at Oct. 31, 2018	1,487,198	$ 8	1,320,279	(8,713)	175,624
Net loss	(1)				(1)
Issuance of common stock upon exercise of stock options (in shares)		68,120
Issuance of common stock upon exercise of stock options	413		413
Issuance of common stock upon vesting of Restricted Stock Units (RSU) (in shares)		312,878
Issuance of common stock upon vesting of Restricted Stock Units (“RSUs”)	0
Stock-based compensation	24,329		24,329
Foreign currency translation adjustment	235			235
Unrealized gain (loss) on available-for-sale securities, net of tax	1,197			1,197
Reclassification adjustment for realized gain (loss) on available-for-sale securities, included in net income (loss)	(273)			(273)
Ending balance (in shares) at Jan. 31, 2019		81,390,505
Ending balance at Jan. 31, 2019	1,513,098	$ 8	1,345,021	(7,554)	175,623
Net loss	(8,581)				(8,581)
Issuance of common stock upon exercise of stock options (in shares)		92,020
Issuance of common stock upon exercise of stock options	744		748
Issuance of common stock upon vesting of Restricted Stock Units (RSU) (in shares)		310,954
Issuance of common stock upon vesting of Restricted Stock Units (“RSUs”)	0
Stock-based compensation	21,130		21,130
Foreign currency translation adjustment	(983)			(983)
Unrealized gain (loss) on available-for-sale securities, net of tax	704			704
Reclassification adjustment for realized gain (loss) on available-for-sale securities, included in net income (loss)	(111)			(111)
Ending balance (in shares) at Apr. 30, 2019		81,793,479
Ending balance at Apr. 30, 2019	1,526,001	$ 8	1,366,899	(7,944)	167,038
Adoption of new accounting standard | ASU 2018-02	0			(107)	107
Beginning balance (in shares) at Jul. 31, 2019		82,140,883
Beginning balance at Jul. 31, 2019	1,574,201	$ 8	1,391,904	(7,758)	190,047
Net loss	(14,991)				(14,991)
Issuance of common stock upon exercise of stock options (in shares)		21,698
Issuance of common stock upon exercise of stock options	368		368
Issuance of common stock upon vesting of Restricted Stock Units (RSU) (in shares)		411,825
Issuance of common stock upon vesting of Restricted Stock Units (“RSUs”)	0
Stock-based compensation	24,765		24,765
Foreign currency translation adjustment	133			133
Unrealized gain (loss) on available-for-sale securities, net of tax	1,003			1,003
Reclassification adjustment for realized gain (loss) on available-for-sale securities, included in net income (loss)	46			46
Ending balance (in shares) at Oct. 31, 2019		82,574,406
Ending balance at Oct. 31, 2019	1,585,525	$ 8	1,417,037	(6,683)	175,163
Beginning balance (in shares) at Jul. 31, 2019		82,140,883
Beginning balance at Jul. 31, 2019	1,574,201	$ 8	1,391,904	(7,758)	190,047
Net loss	$ (65,973)				(65,973)
Issuance of common stock upon exercise of stock options (in shares)	88,328
Reclassification adjustment for realized gain (loss) on available-for-sale securities, included in net income (loss)	$ 266
Ending balance (in shares) at Apr. 30, 2020		83,167,042
Ending balance at Apr. 30, 2020	1,586,013	$ 8	1,471,340	(9,516)	124,181
Beginning balance (in shares) at Oct. 31, 2019		82,574,406
Beginning balance at Oct. 31, 2019	1,585,525	$ 8	1,417,037	(6,683)	175,163
Net loss	(19,944)				(19,944)
Issuance of common stock upon exercise of stock options (in shares)		25,155
Issuance of common stock upon exercise of stock options	872		872
Issuance of common stock upon vesting of Restricted Stock Units (RSU) (in shares)		272,821
Issuance of common stock upon vesting of Restricted Stock Units (“RSUs”)	0
Stock-based compensation	26,688		26,688
Foreign currency translation adjustment	(422)			(422)
Unrealized gain (loss) on available-for-sale securities, net of tax	(121)			(121)
Reclassification adjustment for realized gain (loss) on available-for-sale securities, included in net income (loss)	(33)			(33)
Ending balance (in shares) at Jan. 31, 2020		82,872,382
Ending balance at Jan. 31, 2020	1,592,565	$ 8	1,444,597	(7,259)	155,219
Net loss	(31,038)				(31,038)
Issuance of common stock upon exercise of stock options (in shares)		41,475
Issuance of common stock upon exercise of stock options	1,838		1,838
Issuance of common stock upon vesting of Restricted Stock Units (RSU) (in shares)		253,185
Issuance of common stock upon vesting of Restricted Stock Units (“RSUs”)	0
Stock-based compensation	24,905		24,905
Foreign currency translation adjustment	(2,710)			(2,710)
Unrealized gain (loss) on available-for-sale securities, net of tax	200			200
Reclassification adjustment for realized gain (loss) on available-for-sale securities, included in net income (loss)	253			253
Ending balance (in shares) at Apr. 30, 2020		83,167,042
Ending balance at Apr. 30, 2020	$ 1,586,013	$ 8	$ 1,471,340	$ (9,516)	$ 124,181