Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements Of Income [Abstract]
Net Sales	$ 271,098	$ 252,623	$ 857,400	$ 833,912
Cost of Sales	217,296	200,089	678,309	645,063
Gross Margin	53,802	52,534	179,091	188,849
Selling, General and Administrative Expenses	25,848	23,060	74,915	72,441
Operating Income	27,954	29,474	104,176	116,408
Other Income:
Other income - Continued Dumping and Subsidy Offset Act	0	0	2,701	961
Interest income and other - net	39	54	73	149
Income Before Income Taxes	27,993	29,528	106,950	117,518
Taxes Based on Income	9,771	10,087	37,097	40,447
Net Income	$ 18,222	$ 19,441	$ 69,853	$ 77,071
Net Income Per Common Share:
Basic and Diluted	$ 0.67	$ 0.71	$ 2.56	$ 2.77
Cash Dividends Per Common Share	$ 0.36	$ 0.33	$ 1.05	$ 0.96
Weighted Average Common Shares Outstanding:
Basic	27,216	27,494	27,237	27,755
Diluted	27,251	27,520	27,268	27,781