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STOCK-BASED COMPENSATION - Narrative (Details) $ in Thousands | 3 Months Ended
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Dec. 31, 2019 USD ($) component tranche shares | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 10,201 | $ 7,158
Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of units vested | 0.00% |
Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of units vested | 200.00% |
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Period over which awards expire | 10 years |
Stock-based compensation expense | $ 571 | 1,416
Total intrinsic value of options exercised | 300 | 7,600
Unrecognized compensation cost related to stock options | $ 2,700 |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 9 months 18 days |
Restricted Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 7,370 | 5,742
Unrecognized compensation cost related to non-option awards | $ 57,800 |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 3 years 1 month 6 days |
Vesting period | 4 years |
Performance Share Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 2,260 | 0
Unrecognized compensation cost related to non-option awards | $ 13,600 |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years 2 months 12 days |
Vesting period | 3 years |
Performance components | component | 2 |
Performance Share Units - First Component |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Period over which awards expire | 3 years |
Performance Share Units - Second Component |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Period over which awards expire | 3 years |
Number of tranches | tranche | 3 |
Performance cycle period of each tranche | 1 year |
Contract Drilling Services Operating Expense |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 2,400 | 1,600
Selling, General and Administrative Expense |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 7,800 | $ 5,600
2016 Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) | shares | 0 |
2016 Plan | Restricted Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) | shares | 727,009 |
2016 Plan | Performance Share Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) | shares | 258,857 |

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