Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Numerator:
Net income (loss)	$ (27,198)	$ 20,732	$ (26,743)
Net income per share:
Basic (in USD per share)	$ (0.33)	$ 0.25	$ (0.34)
Diluted (in USD per share)	$ (0.33)	$ 0.25	$ (0.34)
Weighted average shares used in computing net income per share:
Basic (in shares)	82,855,392	81,447,998	77,709,592
Weighted average effect of diluted stock options (in shares)	0	229,035	0
Weighted average effect of dilutive restricted stock units (in shares)	0	1,004,181	0
Diluted (in shares)	82,855,392	82,681,214	77,709,592