Selected Quarterly Financial Data (Schedule Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 308,170		$ 296,174		$ 319,665		$ 298,916		$ 289,874		$ 293,834		$ 326,773		$ 291,361		$ 1,222,925	[1],[2]	$ 1,201,842	[1],[2]	$ 1,191,109	[1],[2]
Gross Profit	76,182		67,913		83,941		75,477		72,486		71,905		93,739		80,634		303,513		318,764		299,629
Net Income	$ 32,387		$ 27,621		$ 45,920	[3]	$ 29,386		$ 28,487		$ 14,471	[4]	$ 38,956		$ 33,400		$ 135,314	[3]	$ 115,314	[4]	$ 121,764
Diluted Net Income Per Common Share (in dollars per share)	$ 1.18	[5]	$ 1.00	[5]	$ 1.67	[3],[5]	$ 1.07	[5]	$ 1.04	[5]	$ 0.53	[4],[5]	$ 1.42	[5]	$ 1.22	[5]	$ 4.92	[3],[5]	$ 4.20	[4],[5]	$ 4.44
Quarterly charges and (credits), amount affecting comparability					$ (8,900)						$ 11,500						$ (9,500)		$ 11,500
Quarterly charges and (credits), per share amount affecting comparability (in dollars per share)					$ (0.32)						$ 0.42						$ (0.35)		$ 0.42

[1] All intercompany transactions have been eliminated.

[2] Net sales and long-lived assets are predominately domestic.

[3] Included in the second quarter net income was the one-time preliminary deferred tax benefit of $8.9 million, or approximately $0.32 per diluted share, resulting from the Tax Act. The fiscal year impact was $9.5 million, or approximately $0.35 per diluted share.

[4] Included in the third quarter and fiscal year net income was expense of $11.5 million, net of taxes, or approximately $0.42 per diluted share, related to a multiemployer pension settlement and other benefit-related costs.

[5] Diluted net income per common share amounts are calculated independently for each of the quarters presented. Accordingly, the sum of the quarterly net income per common share amounts may not agree with the fiscal year.