OPERATIONS BY GEOGRAPHIC AREAS (Schedule Of Operations By Geographic Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2010		Sep. 30, 2012 segment	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Information [Line Items]
Number of Operating Segments																	1
Revenues	$ 252,525	[1]	$ 178,603	[1]	$ 171,621	[1]	$ 184,672	[1]	$ 177,558	[1]	$ 162,147	[1]	$ 159,085	[1]	$ 146,286	[1]	$ 787,421	$ 645,076	$ 650,562
Property and equipment, net	2,537,340								1,887,321								2,537,340	1,887,321	1,343,961
Australia [Member]
Segment Reporting Information [Line Items]
Revenues																	363,400	199,685	134,112
Property and equipment, net	738,504								697,450								738,504	697,450	77,223
Cameroon [Member]
Segment Reporting Information [Line Items]
Revenues																	35,362	625	0
Property and equipment, net	235,573								186,224								235,573	186,224	0
Cote d'Ivoire [Member]
Segment Reporting Information [Line Items]
Revenues																	0	0	7,953
Property and equipment, net	0								0								0	0	88,022
Egypt [Member]
Segment Reporting Information [Line Items]
Revenues																	0	28,486	46,622
Property and equipment, net	23								43								23	43	188,780
Equatorial Guinea [Member]
Segment Reporting Information [Line Items]
Revenues																	126,575	47,271	114,660
Property and equipment, net	3								61,454								3	61,454	66,460
Ghana [Member]
Segment Reporting Information [Line Items]
Revenues																	90,076	136,206	136,012
Property and equipment, net	5,475								7,549								5,475	7,549	9,633
Guyana [Member]
Segment Reporting Information [Line Items]
Revenues																	31,675	73	0
Indonesia [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	4								4								4	4	4
Israel [Member]
Segment Reporting Information [Line Items]
Revenues																	6,301	0	0
Property and equipment, net	81,173								0								81,173	0	0
Korea [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	353,641								161,996								353,641	161,996	0
Malaysia [Member]
Segment Reporting Information [Line Items]
Revenues																	44,413	138,836	103,959
Property and equipment, net	169								52,405								169	52,405	56,144
Malta [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	4,768								5,443								4,768	5,443	6,091
Singapore [Member]
Segment Reporting Information [Line Items]
Revenues																	0	14,607	49,985
Property and equipment, net	84,443								572,911								84,443	572,911	787,529
Suriname [Member]
Segment Reporting Information [Line Items]
Revenues																	13,488	45,060	0
Property and equipment, net	0								84,301								0	84,301	0
Thailand [Member]
Segment Reporting Information [Line Items]
Revenues																	39,598	34,274	34,236
Property and equipment, net	208,303								19,127								208,303	19,127	21,023
Tunsia [Member]
Segment Reporting Information [Line Items]
Revenues																	0	(156)	12,958
United Kingdom [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	1								1								1	1	1
United States [Member]
Segment Reporting Information [Line Items]
Revenues																	36,533	109	10,065
Property and equipment, net	$ 825,260								$ 38,413								$ 825,260	$ 38,413	$ 43,051

[1] The sum of the individual quarterly net income per common share amounts may not agree with year-to-date net income per common share as each quarterly computation is based on the weighted average number of common shares outstanding during that period.