Retirement Plans - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Details) - Defined benefit pension plan - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2024
Net Periodic Benefit Costs:
Service cost	$ 1,241	$ 1,513	$ 1,766
Interest cost	$ 336	75	38
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent
Expected returns on assets	$ (176)	(144)	(142)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent
Amortization of prior service cost (credit)	$ (23)	54	54
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent
Amortization of net gain	$ (207)	0	0
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent
Gain on settlement	$ (518)	0	0
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent
Net periodic benefit costs	$ 653	1,498	1,716
Other Amounts Recognized in Other Comprehensive Loss:
Net (gain) loss arising during the year	406	(3,584)	(850)
Prior service cost (credit)	24	(53)	(54)
Amortization of prior service cost (credit)	0	(678)	24
Amortization of net gain	217	0	0
Effect of settlement	546	4	8
Total recognized in other comprehensive (gain) loss	1,193	(4,311)	(872)
Total recognized in net periodic benefit costs and other comprehensive income (loss)	$ 1,846	$ (2,813)	$ 844
Scenario Forecast
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during fiscal year 2021
Net loss				$ 64
Prior service cost				23
Accumulated other comprehensive income				$ 87