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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended12 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Numerator:           
Income from continuing operations$ 121,514$ 109,828$ 98,961$ 104,365$ 83,291$ 64,883$ 74,105$ 63,802$ 434,668$ 286,081$ 380,546
Loss from discontinued operations        (482)(129,769)(27,001)
NET INCOME121,420109,82698,790104,15083,045(36,715)46,74763,235434,186156,312353,545
Adjustment for basic earnings per share:           
Earnings allocated to unvested shareholders        (1,295)(404)(617)
Numerator for basic earnings per share:           
From continuing operations        433,373285,677379,929
From discontinued operations        (482)(129,769)(27,001)
Net income (loss) attributable to parent, basic        432,891155,908352,928
Adjustment for diluted earnings per share:           
Effect of reallocating undistributed earnings of unvested shareholders        2266
Numerator for diluted earnings per share:           
From continuing operations        433,395285,683379,935
From discontinued operations        (482)(129,769)(27,001)
Net income (loss) attributable to parent, diluted        $ 432,913$ 155,914$ 352,934
Denominator:           
Denominator for basic earnings per share - weighted-average shares (in shares)        106,643105,711105,364
Effect of dilutive shares from stock options and restricted stock (in shares)        1,9891,6931,244
Denominator for diluted earnings per share - adjusted weighted-average shares (in shares)        108,632107,404106,608
Basic earnings per common share:           
Income from continuing operations (in dollars per share)$ 1.13$ 1.02$ 0.92$ 0.98$ 0.78$ 0.61$ 0.70$ 0.61$ 4.06$ 2.70$ 3.61
Loss from discontinued operations (in dollars per share)         $ (1.23)$ (0.26)
Net income (in dollars per share)$ 1.13$ 1.02$ 0.92$ 0.98$ 0.78$ (0.35)$ 0.44$ 0.60$ 4.06$ 1.47$ 3.35
Diluted earnings per common share:           
Income from continuing operations (in dollars per share)$ 1.11$ 1.01$ 0.91$ 0.96$ 0.77$ 0.61$ 0.68$ 0.60$ 3.99$ 2.66$ 3.56
Loss from discontinued operations (in dollars per share)         $ (1.21)$ (0.25)
Net income (in dollars per share)$ 1.11$ 1.01$ 0.91$ 0.96$ 0.77$ (0.34)$ 0.43$ 0.59$ 3.99$ 1.45$ 3.31
Outstanding equity awards           
Shares excluded from calculation of diluted earnings per share (in shares)        3105541,206
Weighted-average price per share (in dollars per share)        $ 47.94$ 38.02$ 33.12