Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 121,764	$ 101,686	$ 74,986
Defined Benefit Pension and Postretirement Benefit Plans:
Net (loss) gain arising during the period, before tax	(4,200)	(3,563)	96
Prior service credit arising during the period, before tax	1,770	0	0
Amortization of loss, before tax	505	401	433
Amortization of prior service credit, before tax	(126)	(5)	(5)
Total Other Comprehensive (Loss) Income, Before Tax	(2,051)	(3,167)	524
Tax Attributes of Items in Other Comprehensive (Loss) Income:
Net (loss) gain arising during the period, tax	1,551	1,318	(36)
Prior service credit arising during the period, tax	(654)	0	0
Amortization of loss, tax	(186)	(149)	(160)
Amortization of prior service credit, tax	47	2	2
Total Tax Benefit (Expense)	758	1,171	(194)
Other Comprehensive (Loss) Income, Net of Tax	(1,293)	(1,996)	330
Comprehensive Income	$ 120,471	$ 99,690	$ 75,316