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INCOME TAXES - ADDITIONAL INFORMATION (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2017
Income Taxes [Line Items] |  |  |
Blended tax rate | 24.30% |  |
Reduction in net deferred tax asset balance | $ 4,900,000 |  |
Net change increase (decrease) in total valuation allowance | 400,000 | $ (10,100,000) |
Investment credit carryforwards | $ 3,890,000 | 3,171,000 |
Research and development credits expiry period beginning year | 2022 |  |
Research and development credit carryforwards | $ 1,900,000 |  |
Unrecognized tax benefits that will impact the company's effective tax rate | 1,300,000 |  |
Accrued interest or penalties | 0 |  |
ASU 2016-09 |  |  |
Income Taxes [Line Items] |  |  |
Cumulative-effect adjustment from the adoption of ASU 2016-09 |  | 8,255,000 |
Retained Earnings | ASU 2016-09 |  |  |
Income Taxes [Line Items] |  |  |
Cumulative-effect adjustment from the adoption of ASU 2016-09 |  | $ 8,255,000 | $ 8,300,000
Research and development credit |  |  |
Income Taxes [Line Items] |  |  |
Investment credit carryforwards | 2,200,000 |  |
Federal |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | $ 27,600,000 |  |
Operating loss carryforwards, expiration start year | 2032 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | $ 30,200,000 |  |
Net operating loss carryforwards will begin to expire | 2028 |  |

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