Accumulated Other Comprehensive (Loss) Income - Components of and Changes in AOCL (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive (Loss) Income	$ (434,588)	$ (414,343)
Other comprehensive (loss) income, net of tax	(20,788)	(984)	$ (87,189)
Post-retirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive (Loss) Income	(221,308)	(215,435)	(208,406)
Other comprehensive loss before reclassifications	(10,100)	(10,402)	(4,163)
Amounts reclassified from accumulated other comprehensive loss	4,227	3,373	8,929
Net current period other comprehensive loss	(5,873)	(7,029)	4,766
Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive (Loss) Income	2,983	3,733	4,503
Other comprehensive loss before reclassifications	(26)	0	0
Amounts reclassified from accumulated other comprehensive loss	(725)	(770)	(770)
Net current period other comprehensive loss	(750)	(770)	(770)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive (Loss) Income	(434,589)	(414,343)	(413,951)
Other comprehensive loss before reclassifications	(23,749)	(2,995)	(91,783)
Other comprehensive (loss) income, net of tax	(20,245)	(392)	(83,624)
Amounts reclassified from accumulated other comprehensive loss	3,502	2,603	8,159
Net current period other comprehensive loss	(20,247)	(392)	(83,624)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive (Loss) Income	(8,680)	(8,139)	(7,547)
Other comprehensive loss before reclassifications	(541)	(592)	(3,565)
Other comprehensive (loss) income, net of tax	(541)	(592)	(3,565)
AOCI Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive (Loss) Income	(8,680)	(8,139)	(7,547)
Other comprehensive loss before reclassifications	(541)	(592)	(3,565)
Other comprehensive (loss) income, net of tax	(541)	(592)	(3,565)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Swap [Member] | Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest Income (Expense), Net	$ (1,020)	$ (1,020)	$ (1,020)