Quarterly report pursuant to Section 13 or 15(d)

Goodwill and intangible assets (Details)

v2.4.0.8
Goodwill and intangible assets (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jan. 31, 2014
Jul. 31, 2013
Jan. 31, 2014
Clinical Labs [Member]
Jul. 31, 2013
Clinical Labs [Member]
Jan. 31, 2014
Intangible Assets, Amortization Period [Member]
Goodwill and intangible assets (Details) [Line Items]          
Goodwill $ 7,452 $ 7,452 $ 7,452 $ 7,452  
Finite-Lived Intangible Asset, Useful Life         5 years 6 months