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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Forecasted effective tax rate |  |  | 15.60% | 17.70% |  |
Forecasted tax credits, net of deferred tax |  |  |  |  |  | $ 27,100
Excess tax benefits associated with vesting of share-based awards | $ 1,500 | $ 1,700 |  |  |  |
Actual effective tax rate since tax effects of awards are treated as discrete item |  |  | 14.80% | 16.60% |  |
Deferred tax assets, federal | 27,500 |  | $ 27,500 |  |  | 27,500
Deferred tax asset, state | 20,200 |  | 20,200 |  |  | 18,200
ITC carryforward | 111,000 |  | $ 111,000 |  |  | 74,000
ITC carryforward, expiration period |  |  | 20 years |  |  |
Federal |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Net operating loss carryforwards | 78,700 |  | $ 78,700 |  |  | 78,700
State |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Net operating loss carryforwards | $ 344,700 |  | $ 344,700 |  |  | 310,600
Valuation allowance |  |  |  |  |  | $ 262
Scenario, Forecast |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Forecasted tax credits, net of deferred tax |  |  |  |  | $ 34,600 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: 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=65882285&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 3: 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=65882285&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: 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=65882285&loc=d3e32632-109319 Reference 2: 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=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 + Details
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