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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)

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