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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
item
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
item
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Jun. 30, 2014
USD ($)
$ / shares
Mar. 31, 2014
USD ($)
$ / shares
Dec. 31, 2013
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Sep. 30, 2013
USD ($)
$ / shares
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)                      
Operating revenues $ 566,110 $ 659,694 $ 883,052 $ 1,056,585 $ 985,038 $ 952,087 $ 893,430 $ 889,152 $ 3,165,441 $ 3,719,707 $ 3,387,614
Operating income (16,021) 132,780 227,172 331,819 263,502 271,912 255,342 264,031 675,750 1,054,787 956,661
Income from continuing operations (21,208) 90,887 149,536 203,057 168,705 192,290 174,589 173,182 422,272 708,766 721,453
Net income $ (21,214) $ 90,860 $ 149,537 $ 203,042 $ 168,688 $ 192,279 $ 174,570 $ 173,182 $ 422,225 $ 708,719 $ 736,639
Basic earnings per common share:                      
Income from continuing operations (in dollars per share) | $ / shares $ (0.20) $ 0.84 $ 1.38 $ 1.87 $ 1.55 $ 1.77 $ 1.61 $ 1.61 $ 3.90 $ 6.54 $ 6.75
Net income (in dollars per share) | $ / shares (0.20) 0.84 1.38 1.87 1.55 1.77 1.61 1.61 3.90 6.54 6.89
Diluted earnings per common share:                      
Income from continuing operations (in dollars per share) | $ / shares (0.20) 0.83 1.37 1.85 1.53 1.75 1.59 1.59 3.87 6.46 6.65
Net income (in dollars per share) | $ / shares $ (0.20) $ 0.83 $ 1.37 $ 1.85 $ 1.53 $ 1.75 $ 1.59 $ 1.59 $ 3.87 $ 6.46 $ 6.79
Gain from the sale of assets, net $ 1,700 $ 1,300 $ 1,900 $ 2,500 $ 5,000 $ 1,400 $ 2,700 $ 3,700      
Gain from the sale of assets, per diluted share (in dollars per share) | $ / shares $ 0.02 $ 0.01 $ 0.02 $ 0.02 $ 0.05 $ 0.01 $ 0.02 $ 0.03      
After-tax impairment charge $ 24,900                    
Impairment charge, per diluted share (in dollars per share) | $ / shares $ 0.23                    
Number of FlexRigs decommissioned | item     17                
Number of land rigs and drilling equipment decommissioned | item 6                    
After-tax abandonment charge $ 19,100   $ 7,500                
Abandonment charge, per diluted share (in dollars per share) | $ / shares $ 0.18   $ 0.05                
Gain on sale of investment securities, net of tax           $ 14,900 $ 12,900        
Gain from the sale of investment securities, per diluted share (in dollars per share) | $ / shares           $ 0.13 $ 0.12