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DEBT (Narrative) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Feb. 28, 2018
USD ($)
Jan. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
item
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                        
Discounts and debt issuance costs                   $ 3,927,000 $ 4,473,000  
Total long-term debt - face value       $ 2,881,529,000         $ 2,846,541,000 2,846,402,000 2,846,541,000 $ 2,881,529,000
Repayments of long term debt         $ 565,560,000         $ 892,049,000 800,572,000  
Net proceeds   $ 846,029,000                    
Net noncash expense         3,029,000     $ 466,000       7,257,000
Premium for repayments of debt         43,020,000     5,608,000       139,187,000
Transaction costs for repayments of debt         $ 28,000     1,314,000       1,586,000
Combined charge, component of interest expense               7,388,000 46,077,000   46,077,000 148,030,000
Investment-Grade Type Covenants Governed [Member]                        
Debt Instrument [Line Items]                        
Number of indentures with customary investment-grade type covenants | item                   3    
Bank Line of Credit [Member]                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity                   $ 750,000,000    
Commitment fee                   0.15%    
Available borrowing capacity                   $ 505,021,000    
Borrowings                   $ 200,000,000    
Bank Line of Credit [Member] | LIBOR [Member]                        
Debt Instrument [Line Items]                        
Applicable margin on borrowing rate                   1.25%    
Bank Line of Credit [Member] | Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin on borrowing rate                   0.25%    
Bank Line of Credit [Member] | Maximum, Upon Certain Acquisitions [Member]                        
Debt Instrument [Line Items]                        
Debt to EBITDA ratio                   3.75    
Standby Letters of Credit [Member]                        
Debt Instrument [Line Items]                        
Outstanding standby letters of credit                   $ 44,979,000    
Period of standby letters of credit                   1 year    
Standby Letters of Credit [Member] | LIBOR [Member]                        
Debt Instrument [Line Items]                        
Applicable margin on borrowing rate                   0.175%    
Maximum [Member] | Bank Line of Credit [Member]                        
Debt Instrument [Line Items]                        
Debt to EBITDA ratio                   3.5    
Commitment fee                   0.25%    
Maximum [Member] | Bank Line of Credit [Member] | LIBOR [Member]                        
Debt Instrument [Line Items]                        
Applicable margin on borrowing rate                   1.75%    
Maximum [Member] | Bank Line of Credit [Member] | Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin on borrowing rate                   0.75%    
Minimum [Member] | Bank Line of Credit [Member]                        
Debt Instrument [Line Items]                        
EBITDA to net cash interest expense ratio                   3.0    
Commitment fee                   0.10%    
Minimum [Member] | Bank Line of Credit [Member] | LIBOR [Member]                        
Debt Instrument [Line Items]                        
Applicable margin on borrowing rate                   1.00%    
Minimum [Member] | Bank Line of Credit [Member] | Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin on borrowing rate                   0.00%    
Term Loan Due 2018 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value [1]       350,000,000         0 $ 0 0 350,000,000
Maturity year                   2018    
Debt issued, term                   6 months    
Notes [Member]                        
Debt Instrument [Line Items]                        
Face value           $ 1,000,000,000            
Net proceeds           989,512,000            
Notes [Member] | 3.90% notes due 2027 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       400,000,000         400,000,000 $ 400,000,000 400,000,000 400,000,000
Maturity year                   2027    
Face value           $ 400,000,000            
Interest rate           3.90% 3.90%     3.90%    
Net proceeds             $ 345,450,000          
Notes [Member] | 3.90% notes due 2027 [Member] | June 2017 Issuance [Member]                        
Debt Instrument [Line Items]                        
Face value           $ 50,000,000            
Notes [Member] | 3.90% notes due 2027 [Member] | March 2017 Issuance [Member]                        
Debt Instrument [Line Items]                        
Face value             350,000,000          
Notes [Member] | Term loan due 2021 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       250,000,000   250,000,000     250,000,000 $ 0 250,000,000 250,000,000
Maturity year                   2021    
Notes [Member] | Investment-Grade Type Covenants Governed [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value                   $ 2,846,188,000    
Notes [Member] | 4.50% notes due 2047 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       700,000,000         700,000,000 $ 700,000,000 700,000,000 700,000,000
Maturity year                   2047    
Face value           $ 700,000,000            
Interest rate           4.50%       4.50%    
Notes [Member] | 4.50% notes due 2025 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       400,000,000         400,000,000 $ 400,000,000 400,000,000 400,000,000
Maturity year                   2025    
Interest rate                   4.50%    
Notes [Member] | Floating-Rate Notes Due 2020 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       250,000,000         250,000,000 $ 250,000,000 250,000,000 250,000,000
Maturity year                   2020    
Face value           $ 250,000,000            
Notes [Member] | 10.375% notes due 2018 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value           250,000,000            
Maturity year                   2018    
Interest rate                   10.375%    
Notes [Member] | 7.00% notes due 2018 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value           $ 272,512,000            
Maturity year                   2018    
Interest rate                   7.00%    
Notes [Member] | 7.50% notes due 2021 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       35,111,000         0 $ 0 0 35,111,000
Maturity year                   2021    
Face value     $ 35,111,000 564,889,000               564,889,000
Interest rate                   7.50%    
Net noncash expense     263,000 4,228,000                
Repayments of debt     40,719,000 662,613,000                
Premium for repayments of debt     $ 5,608,000 96,167,000                
Transaction costs for repayments of debt       1,558,000                
Notes [Member] | 4.70% notes due 2048 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       0         0 $ 460,949,000 0 0
Maturity year                   2048    
Face value $ 460,949,000 $ 350,000,000           $ 460,949,000        
Interest rate   4.70%               4.70%    
Net noncash expense   $ 203,000                    
Premium for repayments of debt 38,164,000                      
Notes [Member] | Floating-Rate Notes Due 2021 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       0         600,000,000 $ 500,000,000 600,000,000 0
Maturity year                   2021    
Face value   $ 500,000,000                    
Notes [Member] | 7.15% notes due 2037 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       $ 240,188,000         240,188,000 $ 129,239,000 240,188,000 $ 240,188,000
Maturity year                   2037    
Repayments of long term debt 110,949,000                      
Interest rate       7.15%           7.15%   7.15%
Transaction costs for repayments of debt $ 1,314,000                      
Bank Line of Credit [Member]                        
Debt Instrument [Line Items]                        
Maturity date                   Dec. 31, 2021    
Total long-term debt - face value       $ 250,000,000 [2]     $ 235,000,000   $ 0 [2] $ 0 [2] $ 0 [2] $ 250,000,000 [2]
[1] This short-term loan was refinanced on a long-term basis in February 2018 as discussed below. Thus, it was classified as long-term debt as of December 31, 2017
[2] Borrowings on the bank line of credit are classified as short-term debt if we intend to repay within twelve months and as long-term debt otherwise.