Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Deferred tax assets, Employee medical and other benefits	$ 8,384	$ 7,809
Deferred tax assets, Operating lease liabilities	5,713	0
Deferred tax assets, Inventories	2,382	311
Deferred tax assets, Receivables	2,371	2,332
Deferred tax assets, Other accrued liabilities	1,938	2,069
Total deferred tax assets	20,788	12,521
Deferred tax liabilities, Property, plant and equipment	(30,036)	(16,993)
Deferred tax liabilities, Goodwill	(11,390)	(10,037)
Deferred tax liabilities, Intangible assets	(7,848)	(8,295)
Deferred tax liabilities, Operating lease right-of-use assets	(5,333)	0
Deferred tax liabilities, Other	(421)	(78)
Total deferred tax liabilities	(55,028)	(35,403)
Net deferred tax liability	$ (34,240)	$ (22,882)