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Property, Plant and Equipment, Net - Schedule of Depreciation Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Abstract]        
Depreciation expense $ 2.6 $ 3.8 $ 7.5 $ 7.7