CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
CONSOLIDATED STATEMENTS OF OPERATIONS
Net revenues	$ 129,201	$ 158,882	$ 243,501	$ 287,733
Cost of sales	109,117	124,347	204,643	229,707
Gross profit	20,084	34,535	38,858	58,026
Selling, general and administrative expense	9,414	10,687	19,225	20,503
Research and technical expense	852	814	1,710	1,579
Operating income	9,818	23,034	17,923	35,944
Interest income	(25)	(33)	(54)	(95)
Interest expense	17	24	34	50
Income before income taxes	9,826	23,043	17,943	35,989
Provision for income taxes	3,390	7,892	5,672	12,395
Net income	$ 6,436	$ 15,151	$ 12,271	$ 23,594
Net income per share:
Basic (in dollars per share)	$ 0.52	$ 1.24	$ 1.00	$ 1.93
Diluted (in dollars per share)	$ 0.52	$ 1.23	$ 0.99	$ 1.92
Dividend declared per common share (in dollars per share)	$ 0.22	$ 0.22	$ 0.44	$ 0.44