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STOCK-BASED COMPENSATION - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) component tranche shares
Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting units ranges |  | 0.00%
Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting units ranges |  | 200.00%
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
The period from the grant date after which options expire |  | 10 years
Total intrinsic value of options exercised | $ 0.3 | $ 7.9
Unrecognized compensation cost | 3.9 | $ 3.9
Weighted average period over which unrecognized compensation cost is expected to be recognized |  | 2 years 1 month 6 days
Restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  | 2 years 4 months 24 days
Vesting period |  | 4 years
Unrecognized compensation cost | 41.8 | $ 41.8
Performance share units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
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 | $ 6.1 | $ 6.1
Performance components | component |  | 2
First Component Of Performance Unit |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
The period from the grant date after which options expire |  | 3 years
Second Component Of Performance Unit |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
The period from the grant date after which options expire |  | 3 years
Number of tranches | tranche |  | 3
Sharebased payment award by performance cycle |  | 1 year
2016 Plan | Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | shares |  | 0
2016 Plan | Restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | shares |  | 474,775
2016 Plan | Performance share units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | shares |  | 145,153

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