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Revisions of Previously-Issued Financial Statements - Summary of Effect of Corrections on Previously Reported Consolidated Balance Sheets (Parenthetical) (Detail) - USD ($)
shares in Millions, $ in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Prior Period Adjustment [Abstract]        
Allowance for doubtful accounts $ 12.1 $ 7.6    
Common stock, shares outstanding 70.6 68.4 69.1 68.9