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, unless otherwise specified
3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Jul. 31, 2014
Indefinite-lived Intangible Assets [Line Items]      
Gross $ 28,094   $ 28,478
Accumulated Amortization (20,537)   (20,370)
Net 7,557   8,108
Amortization expense (431) (468)  
Amortization expense (431) (468)  
Life Sciences [Member]
     
Indefinite-lived Intangible Assets [Line Items]      
Gross 28,094   28,478
Accumulated Amortization (20,537)   (20,370)
Net 7,557   8,108
Amortization expense (431)    
Amortization expense (431)    
Foreign currency translation (384)    
Foreign currency translation 264    
Foreign currency translation $ (120)