Quarterly report pursuant to Section 13 or 15(d)

Goodwill and intangible assets (Details) - Schedule of indefinite-lived intangible assets

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Goodwill and intangible assets (Details) - Schedule of indefinite-lived intangible assets - USD ($)
$ in Thousands
6 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Indefinite-lived Intangible Assets [Line Items]    
July 31, 2015 $ 27,838  
July 31, 2015 (21,683)  
July 31, 2015 6,155  
Amortization expense (843) $ (859)
Amortization expense (843) $ (859)
January 31, 2016 27,488  
January 31, 2016 (22,267)  
January 31, 2016 5,221  
Life Sciences [Member]    
Indefinite-lived Intangible Assets [Line Items]    
July 31, 2015 27,838  
July 31, 2015 (21,683)  
July 31, 2015 6,155  
Amortization expense (843)  
Amortization expense (843)  
Foreign currency translation (350)  
Foreign currency translation 259  
Foreign currency translation (91)  
January 31, 2016 27,488  
January 31, 2016 (22,267)  
January 31, 2016 $ 5,221