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RESTRUCTURING CHARGES - Summary of Restructuring and Other Similar Costs (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 USD ($)
Restructuring Cost and Reserve [Line Items] |
Total restructuring charges | $ 16,047
Operating Segments | North America Solutions |
Restructuring Cost and Reserve [Line Items] |
Total restructuring charges | 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 | 2,980
Operating Segments | Other |
Restructuring Cost and Reserve [Line Items] |
Total restructuring charges | 260
Corporate, Non-Segment |
Restructuring Cost and Reserve [Line Items] |
Total restructuring charges | 4,548
Employee termination benefits |
Restructuring Cost and Reserve [Line Items] |
Total restructuring charges | 19,530
Employee termination benefits | Operating Segments | North America Solutions |
Restructuring Cost and Reserve [Line Items] |
Total restructuring charges | 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 | 2,991
Employee termination benefits | Operating Segments | Other |
Restructuring Cost and Reserve [Line Items] |
Total restructuring charges | 321
Employee termination benefits | Corporate, Non-Segment |
Restructuring Cost and Reserve [Line Items] |
Total restructuring charges | 4,745
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, Non-Segment |
Restructuring Cost and Reserve [Line Items] |
Total restructuring charges | $ 197

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