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INCOME TAXES - ADDITIONAL INFORMATION (Detail) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Income Taxes [Line Items] |  |
Net change in total valuation allowance | $ 10,100,000 | $ 1,900,000
Investment credit carryforwards | 3,171,000 | 44,000
Alternative minimum tax credit carryforwards | $ 392,000 | $ 279,000
Research and development credits expiry period beginning year | 2027 |
Research and development credit carryforwards | $ 1,600,000 |
Accrued interest or penalties | 0 |
Research and development credit |  |
Income Taxes [Line Items] |  |
Investment credit carryforwards | 1,900,000 |
Federal |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | $ 29,400,000 |
Operating loss carryforwards, expiration start year | 2032 |
State |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | $ 29,400,000 |
Net operating loss carryforwards will begin to expire | 2028 |
Federal and state |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | $ 21,100,000 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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