Recent Accounting Pronouncements and Supplemental Information - Components of Non-operating income (expense), net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Recent Accounting Pronouncements and Supplemental Information [Abstract]
Gain on Supplemental Employee Retirement Plan Investments	$ 680	$ 1,381	$ 587	$ 2,139
Other	29	(1)	(64)	(16)
Non-operating income, net	$ 709	$ 1,380	$ 523	$ 2,123