Quarterly report pursuant to Section 13 or 15(d)

Royalty and licensing income (Detail)

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Royalty and licensing income (Detail) (Life Sciences [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Life Sciences [Member]
       
Royalty Revenue $ 0.9 $ 1.1 $ 4.0 $ 4.3