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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee termination benefits |  |  | $ 18,978 |
Stock-based compensation benefit |  |  | (3,483) |
Total restructuring charges | $ 15,495 | $ 0 | 15,495 | $ 0
Corporate G&A |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee termination benefits |  |  | 4,629 |
Stock-based compensation benefit |  |  | (197) |
Total restructuring charges |  |  | 4,432 |
North America Solutions | Operating Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee termination benefits |  |  | 10,273 |
Stock-based compensation benefit |  |  | (3,036) |
Total restructuring charges |  |  | 7,237 |
Offshore Gulf of Mexico | Operating Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee termination benefits |  |  | 1,440 |
Stock-based compensation benefit |  |  | (178) |
Total restructuring charges |  |  | 1,262 |
International Solutions | Operating Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee termination benefits |  |  | 2,308 |
Stock-based compensation benefit |  |  | (11) |
Total restructuring charges |  |  | 2,297 |
Other | Operating Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee termination benefits |  |  | 328 |
Stock-based compensation benefit |  |  | (61) |
Total restructuring charges |  |  | $ 267 |

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