Property, Plant & Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, gross		$ 1,068,994
Finance lease right-of-use asset	$ 25,000
Property, Plant, and Equipment and Finance lease right-of-use asset, before accumulated depreciation	1,853,361
Less accumulated depreciation		(486,204)
Less accumulated depreciation	(638,589)
Property, plant, and equipment, net		582,790
Property, plant, and equipment, net	1,214,772
Finance lease, right-of-use asset, accumulated amortization	5,800	4,200
Land and Land Improvements
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, gross	18,396	9,001
Buildings and Improvements
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, gross	345,736	249,238
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, gross	1,352,835	739,330
Construction in Progress
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, gross	$ 111,394	$ 71,425