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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Segment Reporting (Details) - USD ($) $ in Thousands	Apr. 28, 2018	Apr. 29, 2017	Apr. 28, 2018	Apr. 29, 2017	Jul. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 23,728	$ 24,052	$ 75,892	$ 74,094
Reportable Geographical Components [Member] \| United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	16,789	18,394	53,535	57,660
Long-Lived Assets	2,929		2,929		$ 3,293
Reportable Geographical Components [Member] \| South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	6,939	5,658	22,357	16,434
Long-Lived Assets	1,384		1,384		$ 1,135
Reportable Geographical Components [Member] \| Peru [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,655	1,704	7,344	4,441
Reportable Geographical Components [Member] \| Chile [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,828	1,642	8,070	5,699
Reportable Geographical Components [Member] \| Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,317	2,231	6,713	6,069
Reportable Geographical Components [Member] \| Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 139	$ 81	$ 230	$ 225