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RESTRUCTURING CHARGES - Summary of Restructuring and Other Similar Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | $ 5,926 | $ 16,047
Operating Segments | North America Solutions |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | 3,869 | 7,005
Operating Segments | Offshore Gulf of Mexico |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges |  | 1,254
Operating Segments | International Solutions |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | 207 | 2,980
Operating Segments | Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges |  | 260
Corporate G&A |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | 1,850 | 4,548
Employee termination benefits |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | 1,476 | 19,530
Employee termination benefits | Operating Segments | North America Solutions |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | 54 | 10,041
Employee termination benefits | Operating Segments | Offshore Gulf of Mexico |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges |  | 1,432
Employee termination benefits | Operating Segments | International Solutions |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | 207 | 2,991
Employee termination benefits | Operating Segments | Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges |  | 321
Employee termination benefits | Corporate G&A |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | 1,215 | 4,745
Other restructuring expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | 4,450 |
Other restructuring expenses | Operating Segments | North America Solutions |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | 3,815 |
Other restructuring expenses | Operating Segments | International Solutions |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | 0 |
Other restructuring expenses | Corporate G&A |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges | $ 635 |
Stock-based compensation benefit |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges |  | (3,483)
Stock-based compensation benefit | Operating Segments | North America Solutions |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges |  | (3,036)
Stock-based compensation benefit | Operating Segments | Offshore Gulf of Mexico |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges |  | (178)
Stock-based compensation benefit | Operating Segments | International Solutions |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges |  | (11)
Stock-based compensation benefit | Operating Segments | Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges |  | (61)
Stock-based compensation benefit | Corporate G&A |  |
Restructuring Cost and Reserve [Line Items] |  |
Total restructuring charges |  | $ (197)

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