Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Consolidated Statements of Operations [Abstract]
Revenue	$ 28,455,903	$ 20,523,668	$ 57,632,265	$ 41,583,479
Cost of goods sold	27,726,310	19,806,679	56,214,447	40,205,662
Gross profit	729,593	716,989	1,417,818	1,377,817
Operating expenses:
Distribution, selling, and administrative	376,341	323,536	740,401	644,236
Depreciation	37,968	33,069	75,287	64,943
Amortization	6,526	6,799	13,157	13,609
Warrants	5,663	3,761	121,960	3,761
Employee severance, litigation and other	1,967	(299)	6,269	1,705
Operating income	301,128	350,123	460,744	649,563
Other (income) loss	(3,783)	749	(4,380)	726
Interest expense, net	19,474	18,510	38,306	37,035
Income from continuing operations before income taxes	285,437	330,864	426,818	611,802
Income taxes	105,360	126,721	197,810	233,038
Income from continuing operations	180,077	204,143	229,008	378,764
Loss from discontinued operations, net of income taxes	0	(158,509)	(7,546)	(164,519)
Net income	$ 180,077	$ 45,634	$ 221,462	$ 214,245
Basic earnings per share:
Continuing operations	$ 0.78	$ 0.89	$ 1.00	$ 1.64
Discontinued operations	$ 0	$ (0.69)	$ (0.03)	$ (0.71)
Rounding	$ 0	$ 0	$ (0.01)	$ 0
Total	$ 0.78	$ 0.20	$ 0.96	$ 0.93
Diluted earnings per share:
Continuing operations	$ 0.76	$ 0.87	$ 0.97	$ 1.61
Discontinued operations	$ 0	$ (0.68)	$ (0.03)	$ (0.70)
Total	$ 0.76	$ 0.19	$ 0.94	$ 0.91
Weighted average common shares outstanding:
Basic	229,409	230,422	229,852	231,409
Diluted	236,268	234,587	236,650	235,307
Cash dividends declared per share of common stock	$ 0.235	$ 0.21	$ 0.47	$ 0.42