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
6 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Amortization expense $ 997 $ 779
Amortization expense 997 779
Gross 28,351 27,904
Accumulated Amortization (17,377) (16,124)
Net 10,974 11,780
Life Sciences [Member]
   
Gross 27,904  
Accumulated Amortization (16,124)  
Net 11,780  
Amortization expense (997)  
Amortization expense (997)  
Foreign currency translation 447  
Foreign currency translation (256)  
Foreign currency translation 191  
Gross 28,351  
Accumulated Amortization (17,377)  
Net $ 10,974