CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Product sales	$ 442,597	$ 347,737
Product sales to related party	15,558	14,723
Commissions	3,746	3,714
Total revenues	461,901	366,174
Cost of product sales	399,387	316,102
Gross profit	62,514	50,072
Selling, general and administrative expenses	38,907	31,047
Depreciation and amortization	2,192	1,489
Operating income	21,415	17,536
Other income (expense):
Interest expense	(183)	(182)
Earnings of equity method investees	77	73
Other	188	135
Total other income (expense), net	82	26
Income before taxes	21,497	17,562
Income tax expense	(8,301)	(6,734)
Net income	$ 13,196	$ 10,828
Earnings per common share
Basic	$ 1.05	$ 0.87
Diluted	$ 1.05	$ 0.87
Weighted average common shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	12,581	12,415
Weighted Average Number of Shares Outstanding, Diluted	12,605	12,483