Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Effective Income Tax Reconciliation
Statutory federal income tax	$ (5,109)	$ 2,617	$ (2,224)
State taxes, net of federal benefit	(1,179)	(939)	(993)
Share-based compensation	(2,971)	(8,013)	(8,715)
Non-deductible officers' compensation	3,634	3,938	3,230
Foreign income taxed at different rates	(235)	203	1,022
Research tax credits	(4,905)	(6,943)	(5,822)
Base erosion and anti-abuse tax	11,381	0	0
Re-measurement of U.S. deferred taxes	0	0	36,125
Non-deductible acquisition costs	0	0	1,270
Permanent differences and others	829	918	666
Change in valuation allowance	1,422	(61)	(6,092)
Total provision for (benefit from) income taxes	$ 2,867	$ (8,280)	$ 18,467

Effective Income Tax Rate Reconciliation, Nondeductible Expense, Acquisition Costs, Amount

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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