BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Exposure (Details)	Sep. 30, 2019	Sep. 30, 2018
One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.23	1.30
One British pound sterling into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.23	1.30
One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.09	1.16
One euro into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.09	1.16
One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.67	0.72
One Australian dollar into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.67	0.72
One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1101	0.1228
One Norwegian kroner into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1101	0.1228
One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0027
One Nigerian naira into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0027
High | One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.32	1.43
High | One British pound sterling into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.27	1.33
High | One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.14	1.24
High | One euro into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.13	1.18
High | One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.72	0.78
High | One Australian dollar into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.70	0.75
High | One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1179	0.1290
High | One Norwegian kroner into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1172	0.1249
High | One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0028
High | One Nigerian naira into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0028
Average | One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.26	1.33
Average | One British pound sterling into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.23	1.30
Average | One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.12	1.18
Average | One euro into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.11	1.16
Average | One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.69	0.74
Average | One Australian dollar into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.69	0.73
Average | One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1143	0.1230
Average | One Norwegian kroner into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1129	0.1214
Average | One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0028
Average | One Nigerian naira into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0028
Low | One British pound sterling into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.21	1.27
Low | One British pound sterling into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.21	1.27
Low | One euro into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.09	1.13
Low | One euro into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.09	1.13
Low | One Australian dollar into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.67	0.71
Low | One Australian dollar into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.67	0.71
Low | One Norwegian kroner into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1097	0.1179
Low | One Norwegian kroner into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1097	0.1179
Low | One Nigerian naira into U.S. dollars | Year To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0027
Low | One Nigerian naira into U.S. dollars | Quarter To Date
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0027