BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Revenues from External Customers by Country (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 246,377	$ 614,657
United States
Segment Reporting Information [Line Items]
Revenues	235,444	566,815
Argentina
Segment Reporting Information [Line Items]
Revenues	1,553	40,609
Bahrain
Segment Reporting Information [Line Items]
Revenues	7,549	4,684
United Arab Emirates
Segment Reporting Information [Line Items]
Revenues	990	173
Colombia
Segment Reporting Information [Line Items]
Revenues	429	996
Other Foreign
Segment Reporting Information [Line Items]
Revenues	$ 412	$ 1,380