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Organization and Summary of Significant Accounting Policies - Schedule of Changes in Goodwill (Detail)
$ in Millions
12 Months Ended
Jun. 30, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Beginning balance $ 206.8
Acquisition activity 157.3
Post acquisition adjustments 8.7
Ending balance $ 372.8