Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net Sales	$ 335,550	$ 326,155	$ 621,406	$ 617,131
Cost of Sales	247,242	244,499	471,460	469,758
Gross Margin	88,308	81,656	149,946	147,373
Selling, General and Administrative Expenses	28,937	29,031	52,975	54,176
Operating Income	59,371	52,625	96,971	93,197
Other Income:
Other income-Continued Dumping and Subsidy Offset Act	91	293	91	293
Interest income and other-net	(119)	(39)	(167)	(25)
Income Before Income Taxes	59,343	52,879	96,895	93,465
Taxes Based on Income	20,109	17,602	32,860	31,526
Net Income	$ 39,234	$ 35,277	$ 64,035	$ 61,939
Net Income Per Common Share:
Basic (in dollars per share)	$ 1.44	$ 1.29	$ 2.35	$ 2.26
Diluted (in dollars per share)	$ 1.44	$ 1.28	$ 2.34	$ 2.26
Cash Dividends Per Common Share (in dollars per share)	$ 0.44	$ 5.38	$ 0.84	$ 5.74
Weighted Average Common Shares Outstanding:
Basic (in shares)	27,244	27,243	27,256	27,236
Diluted (in shares)	27,299	27,273	27,306	27,268