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STOCK-BASED COMPENSATION - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) component tranche shares | Jun. 30, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 7,624 | $ 8,878 | $ 28,576 | $ 25,467
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 | $ 422 | 719 | $ 1,409 | 3,073
Number of options exercised (in shares) | shares | 0 |  | 202,000 |
Total intrinsic value of options exercised |  | 300 | $ 300 | 7,900
Unrecognized compensation cost related to stock options | $ 1,600 |  | $ 1,600 |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  | 1 year 4 months 24 days |
Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 8,716 | 6,771 | $ 24,359 | 19,374
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  | 2 years 6 months |
Vesting period |  |  | 4 years |
Unrecognized compensation cost related to non-option awards | 38,800 |  | $ 38,800 |
Performance Share Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 1,969 | 1,388 | $ 6,291 | 3,020
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  | 1 year 10 months 24 days |
Vesting period |  |  | 3 years |
Unrecognized compensation cost related to non-option awards | 8,500 |  | $ 8,500 |
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 | 1,900 | $ 7,600 | 5,400
Selling, General and Administrative Expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 8,700 | $ 6,900 | $ 24,500 | $ 20,100
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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