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, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2013 segment		Sep. 30, 2012		Sep. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments																	1
Revenues	$ 292,721	[1]	$ 272,688	[1]	$ 253,161	[1]	$ 245,093	[1]	$ 252,525	[1]	$ 178,603	[1]	$ 171,621	[1]	$ 184,672	[1]	$ 1,063,663		$ 787,421		$ 645,076
Property and equipment, net	3,164,724								2,537,340								3,164,724		2,537,340		1,887,321
Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	445,538		363,400		199,685
Property and equipment, net	704,158								738,504								704,158		738,504		697,450
Cameroon [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	64,436		35,362		625
Property and equipment, net	172,606								235,573								172,606		235,573		186,224
Egypt [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	0		0		28,330
Equatorial Guinea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	142,637		126,575		47,271
Property and equipment, net	52,085								3								52,085		3		61,454
Ghana [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	113		90,076		136,206
Property and equipment, net	2,296								5,475								2,296		5,475		7,549
Guyana [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	127		31,675		73
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	58,454		6,301		0
Property and equipment, net	77,056								81,173								77,056		81,173		0
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	715,320	[2]							353,641	[2]							715,320	[2]	353,641	[2]	161,996	[2]
Malaysia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	9,198		44,413		138,836
Property and equipment, net	188,241								169								188,241		169		52,405
Malta [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	3,968								4,768								3,968		4,768		5,443
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	0		0		14,607
Property and equipment, net	0	[2]							84,443	[2]							0	[2]	84,443	[2]	572,911	[2]
Suriname [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	0		13,488		45,060
Property and equipment, net	0								0								0		0		84,301
Thailand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	159,853		39,598		34,274
Property and equipment, net	390,420								208,303								390,420		208,303		19,127
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	183,307		36,533		109
Property and equipment, net	$ 858,574								$ 825,288								$ 858,574		$ 825,288		$ 38,461

[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.

[2] Long-lived assets in these geographic areas consist of assets under construction.