Earnings per Share (Details) (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
Numerator:
Income from continuing operations	$ 250,978	$ 149,943	$ 561,656	$ 424,003
Income (loss) from discontinued operations	15,181	(18)	15,186	(73)
NET INCOME	266,159	149,925	576,842	423,930
Adjustment for basic earnings per share:
Earnings allocated to unvested shareholders	(1,441)	(606)	(2,972)	(1,612)
Numerator for basic earnings per share:
From continuing operations	249,537	149,337	558,684	422,391
From discontinued operations	15,181	(18)	15,186	(73)
Net income (loss) attributable to parent, basic	264,718	149,319	573,870	422,318
Adjustment for diluted earnings per share:
Effect of reallocating undistributed earnings of unvested shareholders	15	7	35	22
Numerator for diluted earnings per share:
From continuing operations	249,552	149,344	558,719	422,413
From discontinued operations	15,181	(18)	15,186	(73)
Net income (loss) attributable to parent, diluted	$ 264,733	$ 149,326	$ 573,905	$ 422,340
Denominator:
Denominator for basic earnings per share - weighted-average shares	106,430	107,016	106,206	107,196
Effect of dilutive shares from stock options and restricted stock (in shares)	1,396	1,409	1,511	1,602
Denominator for diluted earnings per share - adjusted weighted-average shares	107,826	108,425	107,717	108,798
Basic earnings per common share:
Income from continuing operations (in dollars per share)	$ 2.35	$ 1.40	$ 5.26	$ 3.94
Income from discontinued operations (in dollars per share)	$ 0.14		$ 0.14
Net income (in dollars per share)	$ 2.49	$ 1.40	$ 5.40	$ 3.94
Diluted earnings per common share:
Income from continuing operations (in dollars per share)	$ 2.32	$ 1.38	$ 5.19	$ 3.88
Income from discontinued operations (in dollars per share)	$ 0.14		$ 0.14
Net income (in dollars per share)	$ 2.46	$ 1.38	$ 5.33	$ 3.88
Outstanding equity awards
Shares excluded from calculation of diluted earnings per share	750	755	801	446
Weighted-average price per share (in dollars per share)	$ 57.29	$ 54.86	$ 57.22	$ 59.68