Annual report pursuant to Section 13 and 15(d)

Segment reporting (Details) - Schedule of segment revenue by geographical

v3.3.0.814
Segment reporting (Details) - Schedule of segment revenue by geographical - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Segment reporting (Details) - Schedule of segment revenue by geographical [Line Items]      
Sales Revenue Net $ 97,599 $ 95,947 $ 93,707
UNITED STATES      
Segment reporting (Details) - Schedule of segment revenue by geographical [Line Items]      
Sales Revenue Net 87,875 84,389 80,559
Life Sciences [Member]      
Segment reporting (Details) - Schedule of segment revenue by geographical [Line Items]      
Sales Revenue Net 34,185 37,258 37,818
Life Sciences [Member] | UNITED STATES      
Segment reporting (Details) - Schedule of segment revenue by geographical [Line Items]      
Sales Revenue Net 24,461 25,700 24,669
Life Sciences [Member] | Foreign Countries [Member]      
Segment reporting (Details) - Schedule of segment revenue by geographical [Line Items]      
Sales Revenue Net $ 9,724 $ 11,558 $ 13,149