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RESTRUCTURING CHARGES - Summary of Restructuring and Other Similar Costs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,110	$ 3,856	$ 15,495
Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	733	915	18,978
Other restructuring expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,377	2,941
Stock-based compensation benefit
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(3,483)
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	516	680	4,432
Corporate | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	516	680	4,629
Corporate | Other restructuring expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0
Corporate | Stock-based compensation benefit
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(197)
North America Solutions | Operating Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,387	2,969	7,237
North America Solutions | Operating Segment | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	10	28	10,273
North America Solutions | Operating Segment | Other restructuring expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,377	2,941
North America Solutions | Operating Segment | Stock-based compensation benefit
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(3,036)
Offshore Gulf of Mexico | Operating Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,262
Offshore Gulf of Mexico | Operating Segment | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,440
Offshore Gulf of Mexico | Operating Segment | Stock-based compensation benefit
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(178)
International Solutions | Operating Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	207	207	2,297
International Solutions | Operating Segment | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	207	207	2,308
International Solutions | Operating Segment | Other restructuring expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 0
International Solutions | Operating Segment | Stock-based compensation benefit
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(11)
Other | Operating Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges			267
Other | Operating Segment | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges			328
Other | Operating Segment | Stock-based compensation benefit
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ (61)

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(1))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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+ References

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