Income Taxes (Details) - USD ($)	Oct. 31, 2017	Jul. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 8,880,000	$ 8,681,000
Interest accrued relating to income taxes	121,000	95,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized	7,875,000	7,727,000
Non-current income taxes payable
Income Tax Contingency [Line Items]
Unrecognized tax benefits	2,550,000	2,515,000
Included in the non-current deferred tax liabilities (as an offset to the associated deferred tax asset)
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 6,330,000	$ 6,166,000