BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of Segment Assets to Consolidated Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Assets	$ 4,484,982	$ 4,381,956
Operating Segments
Segment Reporting Information [Line Items]
Assets	4,114,391	3,954,955
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Assets	370,591	427,001
North America Solutions \| Operating Segments
Segment Reporting Information [Line Items]
Assets	3,340,926	3,320,203
International Solutions \| Operating Segments
Segment Reporting Information [Line Items]
Assets	526,030	407,143
Offshore Gulf of Mexico \| Operating Segments
Segment Reporting Information [Line Items]
Assets	75,885	73,319
Other \| Operating Segments
Segment Reporting Information [Line Items]
Assets	$ 171,550	$ 154,290

Amount of asset recognized for present right to economic benefit.

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+ Details