Annual report pursuant to Section 13 and 15(d)

Royalty and other income (Details)

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Royalty and other income (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Royalty and other income (Details) [Line Items]      
Patent Expiration Date Apr. 24, 2018    
Life Sciences [Member]      
Royalty and other income (Details) [Line Items]      
Royalty Revenue $ 1,521 $ 2,495 $ 4,408