Annual report pursuant to Section 13 and 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
12 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Indefinite-lived Intangible Assets [Line Items]      
Gross $ 28,478 $ 28,214  
Accumulated Amortization (20,370) (18,271)  
Net 8,108 9,943  
Amortization expense, Accumulated Amortization (1,840) (1,990) (1,660)
Amortization expense, Net (1,840) (1,990) (1,660)
Life Sciences [Member]
     
Indefinite-lived Intangible Assets [Line Items]      
Gross 28,478 28,214 27,904
Accumulated Amortization (20,370) (18,271) (16,124)
Net 8,108 9,943 11,780
Amortization expense, Accumulated Amortization (1,840) (1,990)  
Amortization expense, Net (1,840) (1,990)  
Foreign currency translation, Gross 264 310  
Foreign currency translation, Accumulated Amortization (259) (157)  
Foreign currency translation, Net $ 5 $ 153