Income Taxes (Details) - USD ($)	Apr. 30, 2017	Jul. 31, 2016
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 8,654,000	$ 9,171,000
Interest accrued relating to income taxes	81,000	63,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized	7,679,000	8,261,000
Non-current income taxes payable
Income Tax Contingency [Line Items]
Unrecognized tax benefits	2,502,000	2,992,000
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	$ 6,152,000	$ 6,179,000