OPERATIONS BY GEOGRAPHIC AREAS (Schedule of Operations by Geographic Areas) (Details) $ in Thousands		3 Months Ended																12 Months Ended
		Sep. 30, 2015 USD ($)		Jun. 30, 2015 USD ($)	[1]	Mar. 31, 2015 USD ($)	[1]	Dec. 31, 2014 USD ($)	[1]	Sep. 30, 2014 USD ($)		Jun. 30, 2014 USD ($)	[1]	Mar. 31, 2014 USD ($)	[1]	Dec. 31, 2013 USD ($)	[1]	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments | segment																		1
Revenues		$ 363,176	[1]	$ 330,562		$ 350,387		$ 351,726		$ 323,373	[1]	$ 292,777		$ 273,097		$ 284,706		$ 1,395,851	$ 1,173,953	$ 1,063,663
Property and equipment, net		4,172,132								3,967,028								4,172,132	3,967,028	3,164,724
Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		478,939	457,281	445,538
Property and equipment, net		640,530								669,845								640,530	669,845	704,158
Cameroon [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		47,494	43,389	64,436
Property and equipment, net		160,206								166,464								160,206	166,464	172,606
Equatorial Guinea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		45,856	41,245	142,637
Property and equipment, net		0								66,045								0	66,045	52,085
Ghana [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net		0								0								0	0	2,296
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		0	2,749	58,454
Property and equipment, net		0								0								0	0	77,056
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		60,927	58,912	0
Property and equipment, net		77,102								82,617								77,102	82,617	0
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	[2]	693,575								311,494								693,575	311,494	715,320
Malaysia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		22,545	49,610	9,198
Property and equipment, net		254								321								254	321	188,241
Mauritania [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		69,691	0	0
Property and equipment, net		629,179								0								629,179	0	0
Malta [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net		0								3,332								0	3,332	3,968
Morocco [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		119,594	18,128	0
Property and equipment, net		0								627,459								0	627,459	0
Thailand [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		129,634	149,961	159,853
Property and equipment, net		349,972								539,333								349,972	539,333	390,420
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		405,859	352,678	183,307
Property and equipment, net		1,455,109								1,500,118								1,455,109	1,500,118	858,574
Vietnam [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		15,312	0	0
Property and equipment, net		$ 166,205								$ 0								166,205	0	0
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues																		$ 0	$ 0	$ 240

[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 Korea consists of assets under construction