Income Taxes (Details 3) - USD ($) $ in Thousands	Jul. 31, 2020	Jul. 31, 2019
Tax effects of temporary differences
Accruals and reserves	$ 5,831	$ 7,870
Stock-based compensation	6,606	6,353
Deferred revenue	5,553	2,316
Capitalized R&D	4,996	0
Lease liabilities	24,946
Net operating loss carryforwards	53,322	55,881
Tax credits	85,048	74,819
Total deferred tax assets	186,302	147,239
Less valuation allowance	37,188	31,421
Net deferred tax assets	149,114	115,818
Intangible assets	4,381	7,413
Operating lease assets	18,774
Convertible debt	8,696	10,274
Property and equipment	8,274	1,435
Unremitted foreign earnings	354	302
Capitalized commissions	7,070	6,086
Total deferred tax liabilities	47,549	25,510
Deferred tax assets, net	101,565	90,308
Less foreign capitalized commissions	904	906
Total net deferred tax assets	$ 100,661	$ 89,402