BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Exposure (Details)	Sep. 30, 2018	Sep. 30, 2017
One British pound sterling into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.30	1.34
One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.30	1.34
One euro into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.16	1.18
One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.16	1.18
One Australian dollar into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.72	0.78
One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.72	0.78
One Norwegian kroner into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1228	0.1256
One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1228	0.1256
One Nigerian naira into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0027	0.0028
One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0027	0.0028
High | One British pound sterling into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.33	1.36
High | One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.43	1.36
High | One euro into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.18	1.20
High | One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.24	1.20
High | One Australian dollar into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.75	0.81
High | One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.78	0.81
High | One Norwegian kroner into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1249	0.1294
High | One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1290	0.1294
High | One Nigerian naira into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0032
High | One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0033
Average | One British pound sterling into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.30	1.31
Average | One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.33	1.29
Average | One euro into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.16	1.17
Average | One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.18	1.14
Average | One Australian dollar into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.73	0.79
Average | One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.74	0.77
Average | One Norwegian kroner into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1214	0.1257
Average | One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1230	0.1216
Average | One Nigerian naira into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0029
Average | One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0031
Low | One British pound sterling into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.27	1.28
Low | One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.27	1.24
Low | One euro into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.13	1.13
Low | One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.13	1.06
Low | One Australian dollar into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.71	0.76
Low | One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.71	0.74
Low | One Norwegian kroner into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1179	0.1190
Low | One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1179	0.1152
Low | One Nigerian naira into U.S. dollars | Quarter To Date [Member]
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0027	0.0027
Low | One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0027	0.0027