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
3 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Indefinite-lived Intangible Assets [Line Items]    
July 31, 2015 $ 27,838  
July 31, 2015 (21,683)  
July 31, 2015 6,155  
Amortization expense (423) $ (431)
Amortization expense (423) $ (431)
October 31, 2015 27,741  
October 31, 2015 (22,034)  
October 31, 2015 5,707  
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 (423)  
Amortization expense (423)  
Foreign currency translation (97)  
Foreign currency translation 72  
Foreign currency translation (25)  
October 31, 2015 27,741  
October 31, 2015 (22,034)  
October 31, 2015 $ 5,707