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
Oct. 31, 2014
Oct. 31, 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 $ 1.0 $ 1.6