Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 142,332	$ 136,983	$ 150,549
Defined Benefit Pension and Postretirement Benefit Plans:
Net gain (loss) arising during the period, before tax	4,490	(2,662)	(2,902)
Amortization of loss, before tax	672	546	410
Amortization of prior service credit, before tax	(181)	(182)	(182)
Total Other Comprehensive Income (Loss), Before Tax	4,981	(2,298)	(2,674)
Tax Attributes of Items in Other Comprehensive Income (Loss):
Net gain (loss) arising during the period, tax	(1,049)	622	678
Amortization of loss, tax	(157)	(128)	(96)
Amortization of prior service credit, tax	42	42	43
Total Tax (Expense) Benefit	(1,164)	536	625
Other Comprehensive Income (Loss), Net of Tax	3,817	(1,762)	(2,049)
Comprehensive Income	$ 146,149	$ 135,221	$ 148,500