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Reconciliations of Changes in Fair Value of Contingent Consideration (Detail) - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance $ 2.1  
Acquisition-PocketSonics   $ 1.9
Change in fair value (0.1) 0.2
Payments 0.0 0.0
Ending Balance $ 2.0 $ 2.1