CONDENSED CONSOLIDATED STATEMENTS OF INCOME (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
Revenues:
Product sales	$ 535,763	$ 393,706	$ 1,466,547	$ 1,089,830
Product sales to related party	14,351	10,560	44,494	38,401
Commissions	4,555	6,470	12,699	15,791
Total revenues	554,669	410,736	1,523,740	1,144,022
Cost of product sales	485,150	356,649	1,325,089	988,877
Gross profit	69,519	54,087	198,651	155,145
Selling, general and administrative expenses	43,959	33,663	125,799	97,160
Depreciation and amortization	2,273	1,723	6,739	4,879
Operating income	23,287	18,701	66,113	53,106
Other income (expense):
Interest expense	(249)	(166)	(684)	(600)
Earnings of equity method investees	75	51	231	187
Other	166	116	540	394
Total other income (expense), net	(8)	1	87	(19)
Income before taxes	23,279	18,702	66,200	53,087
Income tax expense	(8,776)	(7,312)	(25,323)	(20,537)
Net income	$ 14,503	$ 11,390	$ 40,877	$ 32,550
Earnings per common share
Basic	$ 1.15	$ 0.91	$ 3.24	$ 2.61
Diluted	$ 1.15	$ 0.91	$ 3.23	$ 2.60
Weighted average common shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	12,628	12,484	12,609	12,453
Weighted Average Number of Shares Outstanding, Diluted	12,662	12,526	12,638	12,507