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, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2014 segment		Sep. 30, 2013		Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments																	1
Revenues	$ 323,373	[1]	$ 292,777	[1]	$ 273,097	[1]	$ 284,706	[1]	$ 292,721	[1]	$ 272,688	[1]	$ 253,161	[1]	$ 245,093	[1]	$ 1,173,953		$ 1,063,663		$ 787,421
Property and equipment, net	3,967,028								3,164,724								3,967,028		3,164,724		2,537,340
Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	457,281		445,538		363,400
Property and equipment, net	669,845								704,158								669,845		704,158		738,504
Cameroon [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	43,389		64,436		35,362
Property and equipment, net	166,464								172,606								166,464		172,606		235,573
Equatorial Guinea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	41,245		142,637		126,575
Property and equipment, net	66,045								52,085								66,045		52,085		3
Ghana [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	0		113		90,076
Property and equipment, net	0								2,296								0		2,296		5,475
Guyana [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	0		127		31,675
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	2,749		58,454		6,301
Property and equipment, net	0								77,056								0		77,056		81,173
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	58,912		0		0
Property and equipment, net	82,617								0								82,617		0		0
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	311,494	[2]							715,320	[2]							311,494	[2]	715,320	[2]	353,641	[2]
Malaysia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	49,610		9,198		44,413
Property and equipment, net	321								188,241								321		188,241		169
Malta [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	3,332								3,968								3,332		3,968		4,768
Morocco [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	18,128		0		0
Property and equipment, net	627,459								0								627,459		0		0
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	0	[2]							0	[2]							0	[2]	0	[2]	84,443	[2]
Suriname [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	0		0		13,488
Thailand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	149,961		159,853		39,598
Property and equipment, net	539,333								390,420								539,333		390,420		208,303
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																	352,678		183,307		36,533
Property and equipment, net	$ 1,500,118								$ 858,574								$ 1,500,118		$ 858,574		$ 825,288

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

[2] Property and equipment, net in these geographic areas consist of assets under construction