Income Taxes - Components of the Temporary Differences (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Deferred Tax Assets: [Abstract]
Postretirement benefits	$ 5,349	$ 7,284
Accrued liabilities	2,642	4,759
163(j) Interest Limitation	7,772	4,040
Net operating loss carryforward	55,566	51,413
Intangible assets	6,481	6,936
Right-of-use operating lease liabilities	6,346	7,041
Other	5,436	7,650
Total deferred tax assets	89,592	89,123
Deferred tax liabilities: [Abstract]
Property, plant and equipment	(725)	(15,726)
Right-of-use operating lease assets	6,194	7,174
Other	(2,238)	(79)
Total deferred tax liabilities	(9,157)	(22,979)
Valuation allowance	(80,435)	(66,879)
Net deferred tax liability	$ 0	$ (735)