Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Net income	$ 9,451	$ 7,954	$ 31,874	$ 28,235
Other comprehensive income (loss):
Available-for-sale securities, Pre-tax	3	27	(17)	42
Available-for-sale securities, Tax	(1)	(7)	4	(11)
Available-for-sale securities, Net of Tax	2	20	(13)	31
Postemployment severance actuarial change, Pre-tax	120	100	565	338
Postemployment severance actuarial change, Tax	(31)	(26)	(146)	(87)
Postemployment severance actuarial change, Net of Tax	89	74	419	251
Derivative gain (loss), Pre-tax			0	(11)
Derivative gain (loss), Tax			0	2
Derivative gain (loss), Net of Tax			0	(9)
Reclassification to (earnings) loss:
Amortization of actuarial change, Pre-tax	(82)	(100)	(260)	(302)
Amortization of actuarial change, Tax	21	26	67	78
Amortization of actuarial change, Net of Tax	(61)	(74)	(193)	(224)
Derivatives, Pre-tax			0	21
Derivatives, Tax			0	(5)
Derivatives, Net of Tax			0	16
Other comprehensive income (loss), Pre-tax	41	27	288	88
Other comprehensive income (loss), Tax	(11)	(7)	(75)	(23)
Other comprehensive income (loss), Net of Tax	30	20	213	65
Total comprehensive income	$ 9,481	$ 7,974	$ 32,087	$ 28,300