Property, Plant & Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2021	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	2,084,338	1,853,361
Less accumulated depreciation	(841,432)	(638,589)
Property, plant, and equipment, net	1,242,906	1,214,772
Finance lease, right-of-use asset, accumulated amortization	7,000	6,000
Land and Land Improvements
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, gross	20,454	18,396
Buildings and Improvements
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, gross	419,157	345,736
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, gross	1,483,183	1,352,835
Construction in Progress
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, gross	$ 136,544	$ 111,394