Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		Jul. 31, 2019	Jul. 31, 2018		Jul. 31, 2017		Jul. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Income Tax Penalties Expense			$ 83		$ 218		$ 66
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax at statutory rate		21.00%	26.90%		35.00%		35.00%
State income taxes, net of federal tax benefit			1.60%	[1]	1.00%	[1]	0.80%
International rate differential			(1.10%)		(6.30%)		0.40%
Rate variances arising from foreign subsidiary distributions(1)			0.80%		(5.90%)		0.50%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent			14.10%		0.00%		0.00%
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent			(0.80%)		0.00%		0.00%
Adjustments to tax accruals and reserves(4)	[2]		2.20%		3.60%		(3.70%)
Research and development tax credits and domestic manufacturer’s deduction			(2.00%)		(1.80%)		(3.60%)
Deferred tax and other adjustments, net			(1.60%)		(1.10%)		(2.70%)
Effective tax rate			40.10%		24.50%		26.70%

[1] Years Ended July 31, 2018 2017 2016Tax at statutory rate 26.9 % 35.0 % 35.0 %State income taxes, net of federal tax benefit 1.6 % 1.0 % 0.8 %International rate differential (1.1)% (6.3)% 0.4 %Rate variances arising from foreign subsidiary distributions(1) 0.8 % (5.9)% 0.5 %Foreign tax credit carryforward valuation allowance(2) 14.1 % — % — %Divestiture of business(3) (0.8)% — % — %Adjustments to tax accruals and reserves(4) 2.2 % 3.6 % (3.7)%Research and development tax credits and domestic manufacturer’s deduction (2.0)% (1.8)% (3.6)%Deferred tax and other adjustments, net (1.6)% (1.1)% (2.7)%Effective tax rate 40.1 % 24.5 % 26.7 %

[2] tain tax positions resulting from the closure of audits and lapses in statutes of limitation