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, unless otherwise specified
3 Months Ended 9 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Apr. 30, 2013
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 $ 0.7 $ 0.9 $ 3.4 $ 4.0