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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Total Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Assets	$ 4,588,104	$ 4,829,621
Continuing Operations
Segment Reporting Information [Line Items]
Assets	4,588,104	4,829,621
Discontinued operations
Segment Reporting Information [Line Items]
Assets	0	0
Operating Segment
Segment Reporting Information [Line Items]
Assets	3,950,306	4,109,544
Investments and corporate operations
Segment Reporting Information [Line Items]
Assets	637,798	720,077
North America Solutions | Operating Segment
Segment Reporting Information [Line Items]
Assets	3,610,225	3,812,718
Offshore Gulf of Mexico | Operating Segment
Segment Reporting Information [Line Items]
Assets	90,530	93,501
International Solutions | Operating Segment
Segment Reporting Information [Line Items]
Assets	167,023	181,181
Other | Operating Segment
Segment Reporting Information [Line Items]
Assets	$ 82,528	$ 22,144

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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