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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Total Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Assets	$ 4,495,285	$ 4,829,621
Operating Segment
Segment Reporting Information [Line Items]
Assets	3,857,739	4,109,544
Investments and corporate operations
Segment Reporting Information [Line Items]
Assets	637,546	720,077
North America Solutions | Operating Segment
Segment Reporting Information [Line Items]
Assets	3,518,574	3,812,718
Offshore Gulf of Mexico | Operating Segment
Segment Reporting Information [Line Items]
Assets	90,359	93,501
International Solutions | Operating Segment
Segment Reporting Information [Line Items]
Assets	165,435	181,181
Other | Operating Segment
Segment Reporting Information [Line Items]
Assets	$ 83,371	$ 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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