Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]
Revenues	$ 194,093	$ 141,369	$ 533,035	$ 391,153
Cost of goods sold	150,250	119,505	434,577	318,548
Gross profit	43,843	21,864	98,458	72,605
Selling, general and administrative expenses	24,826	19,410	66,112	61,876
Amortization of intangible assets	704	1,237	2,111	3,658
Operating income	18,313	1,217	30,235	7,071
Gain on sale of investment				(1,229)
Interest expense	59	88	203	296
Interest income	(25)	(66)	(88)	(173)
Income before income taxes	18,279	1,195	30,120	8,177
Income tax provision	6,141	1,122	12,316	3,940
Net income	$ 12,138	$ 73	$ 17,804	$ 4,237
Earnings per share:
Basic	$ 1.03	$ 0.01	$ 1.51	$ 0.36
Diluted	$ 1.02	$ 0.01	$ 1.50	$ 0.36
Weighted average shares:
Basic	11,812	11,740	11,782	11,730
Diluted	11,861	11,812	11,834	11,806