Quarterly report pursuant to Section 13 or 15(d)

Goodwill and intangible assets (Detail) - Schedule of indefinite-lived intangible assets by segment

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Goodwill and intangible assets (Detail) - Schedule of indefinite-lived intangible assets by segment (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Gross $ 27,904  
Accumulated Amortization (16,124)  
Net 11,780  
Amortization expense 497 421
Amortization expense 497 421
Gross 28,218  
Accumulated Amortization (16,798)  
Net 11,420  
Life Sciences [Member]
   
Gross 27,904  
Accumulated Amortization (16,124)  
Net 11,780  
Amortization expense (497)  
Amortization expense (497)  
Foreign currency translation 314  
Foreign currency translation (177)  
Foreign currency translation 137  
Gross 28,218  
Accumulated Amortization (16,798)  
Net $ 11,420