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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, 2017
Jul. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance $ 12.2 $ 2.0
Acquisition - Oncura   10.1
Change in fair value (10.2) 0.1
Payments $ (2.0) 0.0
Ending Balance   $ 12.2