Consolidated Statements of Operations (Unaudited) (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
Consolidated Statements of Operations [Abstract]
Revenue	$ 20,523,668	$ 19,708,371	$ 41,583,479	$ 39,689,556
Cost of goods sold	19,806,679	19,028,630	40,205,662	38,436,553
Gross profit	716,989	679,741	1,377,817	1,253,003
Operating expenses:
Distribution, selling, and administrative	323,536	262,421	644,236	519,606
Depreciation	33,069	26,603	64,943	51,726
Amortization	6,799	4,630	13,609	8,622
Warrants	3,761	0	3,761	0
Employee severance, litigation and other	(299)	9,027	1,705	12,586
Operating income	350,123	377,060	649,563	660,463
Other income	749	(131)	726	(132)
Interest expense, net	18,510	23,375	37,035	45,661
Income before income taxes	330,864	353,816	611,802	614,934
Income taxes	126,721	134,673	233,038	234,199
Income from continuing operations	204,143	219,143	378,764	380,735
Loss from discontinued operations, net of income taxes	158,509	7,038	164,519	6,514
Net income	$ 45,634	$ 212,105	$ 214,245	$ 374,221
Basic earnings per share:
Continuing operations	$ 0.89	$ 0.85	$ 1.64	$ 1.47
Discontinued operations	$ (0.69)	$ (0.03)	$ (0.71)	$ (0.03)
Rounding	$ 0	$ 0	$ 0	$ 0.01
Basic	$ 0.20	$ 0.82	$ 0.93	$ 1.45
Diluted earnings per share:
Continuing operations	$ 0.87	$ 0.84	$ 1.61	$ 1.45
Discontinued operations	$ (0.68)	$ (0.03)	$ (0.70)	$ (0.02)
Rounding	$ 0	$ 0	$ 0	$ (0.01)
Diluted	$ 0.19	$ 0.81	$ 0.91	$ 1.42
Weighted average common shares outstanding:
Basic	230,422	258,162	231,409	258,316
Diluted	234,587	262,363	235,307	262,729
Cash dividends declared per share of common stock	$ 0.21	$ 0.13	$ 0.42	$ 0.26