Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	$ 14,841	$ 20,430	$ 18,362	$ 15,294
Foreign Net Operating Loss Carryforwards Expiration Dates	five years
State Net Operating Loss Carryforwards Expiration Dates	2022 to 2038
Foreign Tax Credit Carryforward Expiration Dates	2021 to 2029
State Research And Development Tax Credit Carryforward Expiration Dates	2020 to 2034
Unrecognized Tax Benefits, Income Tax Penalties Expense	$ 2,357	83	$ 218
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	1,740	2,762
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	5,429
Unrecognized Tax Benefits, Income Tax Penalties Accrued	663	3,027
Unrecognized Tax Benefits Recognized In Other Liabilities	10,218	13,238
Reduction Of Longterm Deferred Income Tax Assets Excluding Interest and Penalties	4,623	$ 7,192
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	9,797
Tax Benefits Associated with Closure of Tax Audits	$ 568
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2016
Internal Revenue Service (IRS) [Member] | Tax Year 2019 [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2019
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 100,335
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	83,826
Other Tax Carryforward, Gross Amount	27,343
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	32,986
Other Tax Carryforward, Gross Amount	$ 12,882