BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Reconciliation of Segment Assets to Consolidated Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Sep. 30, 2025
Segment Reporting [Line Items]
Assets	$ 6,286,774	$ 6,705,738
Operating Segments
Segment Reporting [Line Items]
Assets	6,063,595	6,458,497
Corporate, Non-Segment
Segment Reporting [Line Items]
Assets	223,179	247,241
North America Solutions \| Operating Segments
Segment Reporting [Line Items]
Assets	2,751,463	2,957,139
International Solutions \| Operating Segments
Segment Reporting [Line Items]
Assets	2,313,972	2,426,613
Offshore Solutions \| Operating Segments
Segment Reporting [Line Items]
Assets	690,754	714,708
Other \| Operating Segments
Segment Reporting [Line Items]
Assets	$ 307,406	$ 360,037

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details