Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Income from continuing operations	$ 159,611	$ 144,297
Loss from discontinued operations	(8)	(11)
NET INCOME	159,603	144,286
Adjustment for basic earnings per share:
Earnings allocated to unvested shareholders	(730)	(474)
Numerator for basic earnings per share:
From continuing operations	158,881	143,823
From discontinued operations	(8)	(11)
Net income (loss) attributable to parent, basic	158,873	143,812
Adjustment for diluted earnings per share:
Effect of reallocating undistributed earnings of unvested shareholders	9	7
Numerator for diluted earnings per share:
From continuing operations	158,890	143,830
From discontinued operations	(8)	(11)
Net income (loss) attributable to parent, diluted	$ 158,882	$ 143,819
Denominator:
Denominator for basic earnings per share - weighted-average shares	105,867	107,186
Effect of dilutive shares from stock options and restricted stock	1,545	1,602
Denominator for diluted earnings per share - adjusted weighted-average shares	107,412	108,788
Basic earnings per common share:
Income from continuing operations (in dollars per share)	$ 1.50	$ 1.34
Net income (in dollars per share)	$ 1.50	$ 1.34
Diluted earnings per common share:
Income from continuing operations (in dollars per share)	$ 1.48	$ 1.32
Net income (in dollars per share)	$ 1.48	$ 1.32
Outstanding equity awards
Shares excluded from calculation of diluted earnings per share	806	761
Weighted-average price per share (in dollars per share)	$ 57.24	$ 55.06