Annual report pursuant to Section 13 and 15(d)

Royalty and other income (Details)

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Royalty and other income (Details) (Life Sciences [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Life Sciences [Member]
     
Royalty and other income (Details) [Line Items]      
Royalty Revenue $ 5,144 $ 5,900 $ 6,800