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STOCK-BASED COMPENSATION - Narrative (Details) | 12 Months Ended
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Sep. 30, 2019 USD ($) component year tranche $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 34,292,000 | $ 31,687,000 |  | $ 26,183,000
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 | $ 3,721,000 | $ 7,913,000 |  | 7,439,000
Shares granted (in shares) | shares | 0 | 694,000 | 396,000 |
Vesting period | 1 year |  |  |
Percent of options vesting annually | 25.00% |  |  |
Number of consecutive years that options vest | year | 4 |  |  |
Weighted-average fair value of options granted (in dollars per share) | $ / shares |  | $ 13.17 | $ 20.48 |
Weighted-average remaining life of exercisable stock options | 4 years 5 months 19 days |  |  |
Aggregate intrinsic value of exercisable stock options | $ 400,000 |  |  |
Weighted-average exercise price of exercisable stock options (in dollars per share) | $ / shares | $ 60.38 |  |  |
Options vested or expected to vest (in shares) | shares | 755,761,000,000 |  |  |
Aggregate intrinsic value of options vested or expected to vest | $ 0 |  |  |
Weighted-average exercise price of options vested or expected to vest (in dollars per share) | $ / shares | $ 62.42 |  |  |
Unrecognized compensation cost | $ 3,200,000 |  |  |
Weighted-average compensation cost recognition period | 2 years |  |  |
Intrinsic value of options exercised | $ 7,900,000 | $ 9,900,000 | $ 13,100,000 |
Grant date fair value of shares vested | 8,000,000.0 | 8,800,000 | $ 6,700,000 |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 26,149,000 | 23,774,000 |  | 18,744,000
Weighted-average compensation cost recognition period | 2 years 3 months 18 days |  |  |
Unrecognized compensation cost related to unvested awards | $ 34,900,000 |  |  |
Restricted Stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |
Performance Share Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 4,422,000 | $ 0 |  | $ 0
Vesting period | 3 years |  |  |
Weighted-average compensation cost recognition period | 1 year 10 months 24 days |  |  |
Unrecognized compensation cost related to unvested awards | $ 4,700,000 |  |  |
Number of components included in award units | component | 2 |  |  |
First Component of Performance Share Unit |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Period over which awards expire | 3 years |  |  |
Second Component of Performance Share Unit |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Period over which awards expire | 3 years |  |  |
Performance cycle period of each tranche | 1 year |  |  |
Number of tranches in component | tranche | 3 |  |  |
2016 Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares granted (in shares) | shares | 0 |  |  |
2016 Plan | Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares granted (in shares) | shares | 474,775,000,000 |  |  |
2016 Plan | Performance Share Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares granted (in shares) | shares | 145,153,000,000 |  |  |
Contract Drilling Service Operating Expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 7,500,000 |  |  |
Selling, General and Administrative Expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 26,800,000 |  |  |

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