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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, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 3.6 $ 2.9 $ 7.2 $ 5.5