Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Excess tax benefits related to stock-based compensation	(20.90%)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	$ 10,263	$ 0	$ 0
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	12,394	19,079	18,460
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	900
Impact of Tax Reform	61,000
Deferred Tax Assets, Net	67,000
Unrecognized tax benefits, income tax penalties and interest accrued	5,200	3,600
Income tax examination, penalties and interest expense	(1,600)	$ (2,000)	$ (1,100)
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	4,200
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	4,200
Transition Tax Provisional Charge	$ 6,000
Impacts of the Tax Act	(24.70%)
Interest Expense [Member]
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	$ 10,300
State and Local Jurisdiction [Member]
State operating loss carryforwards	9,200
Operating loss carryforwards, valuation allowance	$ 4,300