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SEGMENT INFORMATION (Details) (USD $)
In Thousands
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
Segment information           
External Sales        $ 2,543,894$ 1,875,162$ 1,843,740
Total Sales700,751644,095604,406594,642558,957483,384436,579396,2422,543,8941,875,1621,843,740
Segment Operating Income (Loss)        748,935498,853640,924
Depreciation        315,468262,658227,535
Amount of Total Assets Attributed to the Reportable Segment4,996,362   4,255,100   4,996,3624,255,1004,008,484
Additions to Long-Lived Assets        730,347345,264819,798
Reconciliation from segment operating income to income from continuing operations before income taxes and equity in income of affiliate           
Segment Operating Income (Loss)        748,935498,853640,924
Income from asset sales        13,9034,9925,402
Gain from involuntary conversion of long-lived assets          541
Corporate general and administrative costs and corporate depreciation        (60,327)(52,049)(37,992)
Operating income from continuing operations193,102174,418164,265170,726133,232111,474101,706105,384702,511451,796608,875
Other income (expense)           
Interest and dividend income        1,9511,8112,755
Interest expense        (17,355)(17,158)(13,590)
Gain on sale of investment securities        913  
Other        (953)1,787245
Total other income (expense)        (15,444)(13,560)(10,590)
Income from continuing operations before income taxes and equity in income of affiliate        687,067438,236598,285
Contract Drilling
           
Segment information           
External Sales        2,528,7741,862,4081,832,965
Total Sales        2,528,7741,862,4081,832,965
Segment Operating Income (Loss)        756,617505,618647,956
Depreciation        306,829254,109218,409
Amount of Total Assets Attributed to the Reportable Segment4,204,185   3,801,063   4,204,1853,801,0633,476,138
Additions to Long-Lived Assets        721,979339,053815,284
Reconciliation from segment operating income to income from continuing operations before income taxes and equity in income of affiliate           
Segment Operating Income (Loss)        756,617505,618647,956
U.S. Land
           
Segment information           
External Sales        2,100,5081,412,4951,441,164
Total Sales        2,100,5081,412,4951,441,164
Segment Operating Income (Loss)        691,615404,278573,708
Depreciation        264,127211,652187,259
Amount of Total Assets Attributed to the Reportable Segment3,719,387   3,257,382   3,719,3873,257,3822,955,574
Additions to Long-Lived Assets        694,249305,206703,073
Reconciliation from segment operating income to income from continuing operations before income taxes and equity in income of affiliate           
Segment Operating Income (Loss)        691,615404,278573,708
Offshore
           
Segment information           
External Sales        201,417202,734204,702
Total Sales        201,417202,734204,702
Segment Operating Income (Loss)        45,29153,06955,293
Depreciation        14,68412,51911,872
Amount of Total Assets Attributed to the Reportable Segment151,656   132,342   151,656132,342129,465
Additions to Long-Lived Assets        7,0929,98217,584
Reconciliation from segment operating income to income from continuing operations before income taxes and equity in income of affiliate           
Segment Operating Income (Loss)        45,29153,06955,293
International Land
           
Segment information           
External Sales        226,849247,179187,099
Total Sales        226,849247,179187,099
Segment Operating Income (Loss)        19,71148,27118,955
Depreciation        28,01829,93819,278
Amount of Total Assets Attributed to the Reportable Segment333,142   411,339   333,142411,339391,099
Additions to Long-Lived Assets        20,63823,86594,627
Reconciliation from segment operating income to income from continuing operations before income taxes and equity in income of affiliate           
Segment Operating Income (Loss)        19,71148,27118,955
Other.
           
Segment information           
External Sales        15,12012,75410,775
Intersegment sales        829814836
Total Sales        15,94913,56811,611
Segment Operating Income (Loss)        (7,682)(6,765)(7,032)
Depreciation        8,6398,5499,126
Amount of Total Assets Attributed to the Reportable Segment792,177   454,037   792,177454,037532,346
Additions to Long-Lived Assets        8,3686,2114,514
Reconciliation from segment operating income to income from continuing operations before income taxes and equity in income of affiliate           
Segment Operating Income (Loss)        (7,682)(6,765)(7,032)
Reportable and other
           
Segment information           
External Sales        2,543,8941,875,1621,843,740
Intersegment sales        829814836
Total Sales        2,544,7231,875,9761,844,576
Segment Operating Income (Loss)        748,935498,853640,924
Depreciation        315,468262,658227,535
Amount of Total Assets Attributed to the Reportable Segment4,996,362   4,255,100   4,996,3624,255,1004,008,484
Additions to Long-Lived Assets        730,347345,264819,798
Reconciliation from segment operating income to income from continuing operations before income taxes and equity in income of affiliate           
Segment Operating Income (Loss)        748,935498,853640,924
Eliminations
           
Segment information           
Intersegment sales        (829)(814)(836)
Total Sales        $ (829)$ (814)$ (836)