Recent Accounting Pronouncements and Supplemental Information - Components of Non-operating income (expense), net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Recent Accounting Pronouncements and Supplemental Information [Abstract]
Gain (Loss) on SERP Investments	$ 428	$ (1,784)	$ 2,567	$ (1,010)
Other	(117)	(294)	(133)	(350)
Non-operating income (expense), net	$ 311	$ (2,078)	$ 2,434	$ (1,360)