CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Product sales	$ 586,442	$ 535,763	$ 1,677,134	$ 1,466,547
Product sales to related party	15,229	14,351	51,034	44,494
Commissions	4,772	4,555	14,237	12,699
Total revenues	606,443	554,669	1,742,405	1,523,740
Cost of product sales	528,932	485,150	1,513,286	1,325,089
Gross profit	77,511	69,519	229,119	198,651
Selling, general and administrative expenses	48,432	43,959	143,820	125,799
Depreciation and amortization	2,545	2,273	7,450	6,739
Operating income	26,534	23,287	77,849	66,113
Other income (expense):
Interest expense	(173)	(249)	(599)	(684)
Earnings of equity method investees	75	75	253	231
Other	154	166	567	540
Total other income (expense), net	56	(8)	221	87
Income before taxes	26,590	23,279	78,070	66,200
Income tax expense	(9,809)	(8,776)	(29,438)	(25,323)
Net income	$ 16,781	$ 14,503	$ 48,632	$ 40,877
Earnings per common share
Basic	$ 1.32	$ 1.15	$ 3.84	$ 3.24
Diluted	$ 1.32	$ 1.15	$ 3.83	$ 3.23
Weighted average common shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	12,679	12,628	12,672	12,609
Weighted Average Number of Shares Outstanding, Diluted	12,713	12,662	12,705	12,638