Property Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Property, Plant and Equipment [Line Items]
Finance lease right-of-use asset	$ 25,000	$ 25,000
Property, plant, and equipment and finance lease right-of-use asset, before accumulated depreciation	1,886,529	1,853,361
Less accumulated depreciation	(667,954)	(638,589)
Property, plant, and equipment, net	1,218,575	1,214,772
Land and Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	19,726	18,396
Buildings and Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	387,696	345,736
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	1,339,809	1,352,835
Construction in Progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	$ 114,298	$ 111,394