Quarterly report pursuant to Section 13 or 15(d)

Royalty and licensing income (Details)

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Royalty and licensing income (Details) - USD ($)
$ in Millions
9 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Royalty and licensing income (Details) [Line Items]    
Patent Expiration Date Apr. 24, 2018  
Life Sciences [Member]    
Royalty and licensing income (Details) [Line Items]    
Royalty Revenue $ 1.1 $ 2.1