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Property Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, gross $ 1,014,184 $ 947,863
Less accumulated depreciation (454,665) (422,973)
Property, Plant and Equipment, net 559,519 524,890
Land and Improvements    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, gross 8,895 9,072
Buildings and Improvements    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, gross 226,229 216,507
Machinery and Equipment    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, gross 694,191 633,934
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, gross $ 84,869 $ 88,350