Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income	$ 46,270	$ 54,235	$ 129,301	$ 145,003
Amounts reclassified from accumulated other comprehensive loss:
Amortization of net actuarial loss included in net periodic benefit cost	134	119	402	357
Amortization of prior service credit included in net periodic benefit cost	(1)	(2)	(3)	(6)
Settlement gain	0	0	0	(8)
Other comprehensive income before income taxes	133	117	399	343
Income tax expense related to items of other comprehensive income	(37)	(32)	(112)	(96)
Other comprehensive income	96	85	287	247
Comprehensive income	$ 46,366	$ 54,320	$ 129,588	$ 145,250