Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net Sales	$ 296,174	$ 293,834	$ 914,755	$ 911,968
Cost of Sales	228,261	221,929	687,424	665,690
Gross Profit	67,913	71,905	227,331	246,278
Selling, General and Administrative Expenses	30,248	32,253	98,075	96,514
Multiemployer Pension Settlement and Related Costs	0	17,639	0	17,639
Operating Income	37,665	22,013	129,256	132,125
Other, Net	375	144	1,145	437
Income Before Income Taxes	38,040	22,157	130,401	132,562
Taxes Based on Income	10,419	7,686	27,474	45,735
Net Income	$ 27,621	$ 14,471	$ 102,927	$ 86,827
Net Income Per Common Share:
Basic (in dollars per share)	$ 1.01	$ 0.53	$ 3.75	$ 3.17
Diluted (in dollars per share)	1.00	0.53	3.74	3.16
Cash Dividends Per Common Share (in dollars per share)	$ 0.60	$ 0.55	$ 1.75	$ 1.60
Weighted Average Common Shares Outstanding:
Basic (in shares)	27,405	27,379	27,399	27,369
Diluted (in shares)	27,458	27,442	27,456	27,438