Condensed 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
Condensed Consolidated Statements of Operations [Abstract]
Revenues	$ 153,915	$ 181,486	$ 307,856	$ 338,942
Cost of goods sold	122,200	147,249	242,357	284,327
Gross profit	31,715	34,237	65,499	54,615
Selling, general and administrative expenses	24,060	21,523	46,433	41,286
Amortization of intangible assets	413	704	828	1,407
Operating income	7,242	12,010	18,238	11,922
Other income	(1,709)		(1,709)
Interest expense	43	68	104	144
Interest income	(2)	(34)	(21)	(63)
Income before income taxes	8,910	11,976	19,864	11,841
Income tax provision	2,092	4,565	5,661	6,175
Net income	$ 6,818	$ 7,411	$ 14,203	$ 5,666
Earnings per share:
Basic	$ 0.57	$ 0.63	$ 1.19	$ 0.48
Diluted	$ 0.57	$ 0.63	$ 1.18	$ 0.48
Weighted average shares:
Basic	11,953	11,762	11,946	11,765
Diluted	12,029	11,835	12,021	11,836