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STOCK-BASED COMPENSATION (Details) (USD $)
1 Months Ended12 Months Ended1 Months Ended12 Months Ended1 Months Ended12 Months Ended
Dec. 31, 2009
Y
Sep. 30, 2011
Unit
USDPerRight
D
M
Right
multiple
Arbitration
SquareFoot
Plan
Y
Rig
Sep. 30, 2010
Sep. 30, 2009
Dec. 31, 2010
Stock options
Sep. 30, 2011
Stock options
Y
Sep. 30, 2010
Stock options
Y
Sep. 30, 2009
Stock options
Y
Dec. 31, 2010
Restricted stock
Sep. 30, 2011
Restricted stock
Sep. 30, 2010
Restricted stock
Sep. 30, 2009
Restricted stock
Common-stock based award plan            
Number of prior equity plans 1          
The period from the grant date after which options expire (in years)     10Y      
Granted (in shares)        169,375169,375182,000 
Participant's age for retirement eligibility (in years)55           
Minimum continuous service period as a full-time employee for retirement eligibility (in years)15           
Additional compensation cost  $ 4,900,000         
Compensation expense (in dollars) 12,101,00015,855,0008,348,000 7,224,00011,475,0006,899,000 4,877,0004,380,0001,449,000
Excess tax benefit from stock-based compensation $ 12,511,000$ 3,344,000$ 1,217,000        
Vesting period, minimum (in years)     1Y   3Y  
Option vesting rights (as a percent)     25.00%      
Vesting period, maximum (in years)     4Y   6Y  
Weighted-average assumptions utilized in determining the fair value of options            
Risk-free interest rate (as a percent)     1.90%2.30%1.70%    
Expected stock volatility (as a percent)     51.60%49.90%43.30%    
Dividend yield (as a percent)     0.50%0.50%0.90%    
Expected term (in years)     5.55.85.8    
Weighted-average fair value of options granted (in dollars per share)     $ 22.20$ 17.64$ 8.16    
Options            
Options outstanding at the beginning of the period (in shares)     5,572,0005,401,0004,819,000    
Granted (in shares)    324,162324,162570,000865,000    
Exercised (in shares)     (1,289,000)(397,000)(267,000)    
Forfeited/Expired (in shares)     (18,000)(2,000)(16,000)    
Option outstanding at the end of the period (in shares)     4,589,0005,572,0005,401,000    
Exercisable (in shares)     3,287,0003,888,0003,599,000    
Shares available to grant (in shares)     6,000,000761,0001,656,000    
Weighted-Average Exercise Price            
Outstanding at the beginning of the period (in dollars per share)     $ 22.82$ 20.55$ 20.02    
Granted (in dollars per share)     $ 47.94$ 38.02$ 21.07    
Exercised (in dollars per share)     $ 18.24$ 13.63$ 12.18    
Forfeited/Expired (in dollars per share)     $ 34.06$ 38.02$ 26.91    
Outstanding at the end of the period (in dollars per share)     $ 25.84$ 22.82$ 20.55    
Exercisable (in dollars per share)     $ 22.35$ 19.68$ 17.42