Income taxes.

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Tax Cuts And Jobs Act, Change In Tax Rate, Base Erosion And Anti-Abuse Tax Liability

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences.

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details Textual) - USD ($) $ in Thousands	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Income Taxes (Additional Textual) [Abstract]
Provision for (benefit from) income taxes	$ 2,867	$ (8,280)	$ 18,467
Tax Cuts And Jobs Act, Change In Tax Rate, Base Erosion And Anti-Abuse Tax Liability	$ 11,400
Effective tax rate	(12.00%)
Percentage of statutory federal income tax rate	21.00%	21.00%	27.00%
Valuation allowance	$ 37,188	$ 31,421
Valuation allowance increase	5,800
Undistributed earnings from certain foreign subsidiaries	354	302
Increase in long term liability associated with unrecognized tax benefits	12,100
Unrecognized tax benefits	18,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible	8,000
2020 Fiscal Year
Income Taxes (Additional Textual) [Abstract]
Tax Cuts And Jobs Act, Change In Tax Rate, Base Erosion And Anti-Abuse Tax Liability	7,700
2019 Fiscal Year
Income Taxes (Additional Textual) [Abstract]
Tax Cuts And Jobs Act, Change In Tax Rate, Base Erosion And Anti-Abuse Tax Liability		$ 3,700
U.S. Federal
Income Taxes (Additional Textual) [Abstract]
Operating loss carryforwards	205,500
California
Income Taxes (Additional Textual) [Abstract]
Operating loss carryforwards	57,400
State and Local Jurisdiction
Income Taxes (Additional Textual) [Abstract]
Operating loss carryforwards	$ 97,300