EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Income from continuing operations	$ 159,797	$ 250,978	$ 151,067	$ 159,611	$ 149,606	$ 149,943	$ 129,763	$ 144,297	$ 721,453	$ 573,609	$ 434,668
Income (loss) from discontinued operations									15,186	7,436	(482)
NET INCOME	159,797	266,159	151,080	159,603	157,115	149,925	129,719	144,286	736,639	581,045	434,186
Adjustment for basic earnings per share:
Earnings allocated to unvested shareholders									(3,842)	(2,246)	(1,295)
Numerator for basic earnings per share:
From continuing operations									717,611	571,363	433,373
From discontinued operations									15,186	7,436	(482)
Net income (loss) attributable to parent, basic									732,797	578,799	432,891
Adjustment for diluted earnings per share:
Effect of reallocating undistributed earnings of unvested shareholders									46	31	22
Numerator for diluted earnings per share:
From continuing operations									717,657	571,394	433,395
From discontinued operations									15,186	7,436	(482)
Net income (loss) attributable to parent, diluted									$ 732,843	$ 578,830	$ 432,913
Denominator:
Denominator for basic earnings per share - weighted-average shares									106,286	106,819	106,643
Effect of dilutive shares from stock options and restricted stock (in shares)									1,593	1,558	1,989
Denominator for diluted earnings per share - adjusted weighted-average shares									107,879	108,377	108,632
Basic earnings per common share:
Income from continuing operations (in dollars per share)	$ 1.49	$ 2.35	$ 1.41	$ 1.50	$ 1.41	$ 1.40	$ 1.20	$ 1.34	$ 6.75	$ 5.35	$ 4.06
Income from discontinued operations (in dollars per share)									$ 0.14	$ 0.07
Net income (in dollars per share)	$ 1.49	$ 2.49	$ 1.41	$ 1.50	$ 1.48	$ 1.40	$ 1.20	$ 1.34	$ 6.89	$ 5.42	$ 4.06
Diluted earnings per common share:
Income from continuing operations (in dollars per share)	$ 1.47	$ 2.32	$ 1.39	$ 1.48	$ 1.39	$ 1.38	$ 1.18	$ 1.32	$ 6.65	$ 5.27	$ 3.99
Income from discontinued operations (in dollars per share)									$ 0.14	$ 0.07
Net income (in dollars per share)	$ 1.47	$ 2.46	$ 1.39	$ 1.48	$ 1.46	$ 1.38	$ 1.18	$ 1.32	$ 6.79	$ 5.34	$ 3.99
Outstanding equity awards
Shares excluded from calculation of diluted earnings per share									743	446	310
Weighted-average price per share (in dollars per share)									$ 57.27	$ 59.68	$ 47.94