Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	$ 13,622	$ 14,841	$ 20,430	$ 18,362
State Net Operating Loss Carryforwards Expiration Dates	2025 to 2040
Foreign Tax Credit Carryforward Expiration Dates	2021 to 2029
State Research And Development Tax Credit Carryforward Expiration Dates	2021 to 2035
Unrecognized Tax Benefits, Income Tax Penalties Expense	$ 96	2,357	$ 83
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	1,354	1,740
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	1,437
Unrecognized Tax Benefits, Income Tax Penalties Accrued	658	663
Unrecognized Tax Benefits Recognized In Other Liabilities	8,931	10,218
Reduction Of Longterm Deferred Income Tax Assets Excluding Interest and Penalties	4,691	$ 4,623
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	504
Tax Benefits Associated with Closure of Tax Audits	$ 5,133
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2018
Internal Revenue Service (IRS) [Member] | Tax Year 2019 [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2020
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 96,104
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	86,063
Other Tax Carryforward, Gross Amount	24,633
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	29,109
Other Tax Carryforward, Gross Amount	$ 12,714