Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income	$ 39,964	$ 43,838	$ 83,031	$ 90,768
Amounts reclassified from accumulated other comprehensive loss:
Amortization of net actuarial loss included in net periodic benefit cost	134	119	268	238
Amortization of prior service credit included in net periodic benefit cost	(1)	(2)	(2)	(4)
Settlement gain	0	0	0	(8)
Other comprehensive income before income taxes	133	117	266	226
Income tax expense related to items of other comprehensive income	(39)	(32)	(75)	(64)
Other comprehensive income	94	85	191	162
Comprehensive income	$ 40,058	$ 43,923	$ 83,222	$ 90,930