Balance Sheet Components (Details 8) - USD ($) $ in Thousands	12 Months Ended
Jul. 31, 2018	Jul. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	$ (5,796)	$ (6,593)
Foreign currency translation adjustments	(2,163)	714
Unrealized loss on available-for-sale securities	(22)	(151)
Tax effect	233	234
Balance at end of period	(7,748)	(5,796)
Foreign Currency Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	(5,630)	(6,809)
Foreign currency translation adjustments	(1,567)	1,179
Unrealized loss on available-for-sale securities	0	0
Tax effect	0	0
Balance at end of period	(7,197)	(5,630)
Unrealized gain (loss) on available-for-sale securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	(166)	216
Foreign currency translation adjustments	(596)	(465)
Unrealized loss on available-for-sale securities	(22)	(151)
Tax effect	233	234
Balance at end of period	$ (551)	$ (166)

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
-Paragraph 14A
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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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