BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Exposure (Details) - Year To Date	Jun. 30, 2018	Jun. 30, 2017
One British pound sterling into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.32	1.30
One euro into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.17	1.14
One Australian dollar into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.74	0.77
One Norwegian kroner into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1227	0.1194
One Nigerian naira into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0032
High | One British pound sterling into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.43	1.30
High | One euro into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.24	1.14
High | One Australian dollar into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.78	0.77
High | One Norwegian kroner into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1290	0.1199
High | One Nigerian naira into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0033
Average | One British pound sterling into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.36	1.28
Average | One euro into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.19	1.10
Average | One Australian dollar into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.76	0.75
Average | One Norwegian kroner into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1247	0.1174
Average | One Nigerian naira into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0032
Low | One British pound sterling into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.31	1.24
Low | One euro into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	1.16	1.06
Low | One Australian dollar into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.73	0.74
Low | One Norwegian kroner into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.1209	0.1152
Low | One Nigerian naira into U.S. dollars
Schedule of Foreign Currency [Line Items]
Foreign currency exchange rates	0.0028	0.0032