Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock	Total
Balance at Sep. 30, 2011	$ 10,724	$ 210,909	$ 2,954,210	$ 98,908	$ (4,704)	$ 3,270,047
Balance (in shares) at Sep. 30, 2011					157,000
Balance (in shares) at Sep. 30, 2011	107,243,000
Comprehensive Income:
Net income			581,045			581,045
Other comprehensive income (loss)				67,899		67,899
Dividends declared ($2.625, $1.30 and $.28 per share for the years ended 2014, 2013 and 2012, respectively)			(29,960)			(29,960)
Exercise of stock options	32	5,398			(2,757)	2,673
Exercise of stock options (in shares)	315,000				47,000
Tax benefit of stock-based awards, including excess tax benefits of $3.6 million for the year ended 2012		4,340				4,340
Stock issued for vested restricted stock, net of shares withheld for employee taxes	4	(2,485)			967	(1,514)
Stock issued for vested restricted stock, net of shares withheld for employee taxes (in shares)	41,000				(51,000)
Repurchase of common stock					(77,610)	(77,610)
Repurchase of common stock (in shares)					1,748,000	1,747,819
Stock-based compensation		18,078				18,078
Balance at Sep. 30, 2012	10,760	236,240	3,505,295	166,807	(84,104)	3,834,998
Balance (in shares) at Sep. 30, 2012					1,901,000
Balance (in shares) at Sep. 30, 2012	107,599,000
Comprehensive Income:
Net income			736,639			736,639
Other comprehensive income (loss)				(34,277)		(34,277)
Dividends declared ($2.625, $1.30 and $.28 per share for the years ended 2014, 2013 and 2012, respectively)			(139,271)			(139,271)
Exercise of stock options	106	21,746			(8,535)	13,317
Exercise of stock options (in shares)	1,057,000				162,000
Tax benefit of stock-based awards, including excess tax benefits of $3.6 million for the year ended 2012		10,727				10,727
Stock issued for vested restricted stock, net of shares withheld for employee taxes	8	(3,226)			1,541	(1,677)
Stock issued for vested restricted stock, net of shares withheld for employee taxes (in shares)	83,000				(41,000)
Repurchase of common stock (in shares)						0
Stock-based compensation		23,271				23,271
Balance at Sep. 30, 2013	10,874	288,758	4,102,663	132,530	(91,098)	4,443,727
Balance (in shares) at Sep. 30, 2013					2,022,000	2,021,607
Balance (in shares) at Sep. 30, 2013	108,739,000					108,738,577
Comprehensive Income:
Net income			708,719			708,719
Other comprehensive income (loss)				(49,404)		(49,404)
Dividends declared ($2.625, $1.30 and $.28 per share for the years ended 2014, 2013 and 2012, respectively)			(285,585)			(285,585)
Exercise of stock options	161	41,911			(18,822)	23,250
Exercise of stock options (in shares)	1,613,000				216,000
Tax benefit of stock-based awards, including excess tax benefits of $3.6 million for the year ended 2012		26,616				26,616
Stock issued for vested restricted stock, net of shares withheld for employee taxes	16	(16)			(3,049)	(3,049)
Stock issued for vested restricted stock, net of shares withheld for employee taxes (in shares)	157,000				38,000
Repurchase of common stock (in shares)						0
Stock-based compensation		26,703				26,703
Balance at Sep. 30, 2014	$ 11,051	$ 383,972	$ 4,525,797	$ 83,126	$ (112,969)	$ 4,890,977
Balance (in shares) at Sep. 30, 2014					2,276,000	2,276,321
Balance (in shares) at Sep. 30, 2014	110,509,000					110,508,605