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STOCK-BASED COMPENSATION - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) component tranche shares | Mar. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 10,751 | $ 9,431 | $ 20,952 | $ 16,589
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] |  |  |  |
Stock-based compensation expense | 416 | 938 | $ 987 | 2,354
Total intrinsic value of options exercised |  | 100 | 300 | 7,700
Unrecognized compensation cost related to stock options | 2,300 |  | $ 2,300 |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  | 1 year 7 months 6 days |
Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 8,273 | 6,861 | $ 15,643 | 12,603
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  | 2 years 7 months 6 days |
Vesting period |  |  | 4 years |
Unrecognized compensation cost related to non-option awards | 49,700 |  | $ 49,700 |
Performance Share Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 2,062 | 1,632 | $ 4,322 | 1,632
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  | 2 years |
Vesting period |  |  | 3 years |
Unrecognized compensation cost related to non-option awards | 11,600 |  | $ 11,600 |
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 | 2,900 | 1,800 | $ 5,300 | 3,400
Selling, General and Administrative Expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 7,900 | $ 7,600 | $ 15,700 | $ 13,200
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 |
2020 Plan | Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards granted (in shares) | shares |  |  | 54,118 |

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