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STOCK-BASED COMPENSATION - DEFERRED RETENTION STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Deferred retention stock |  |  |
Shares |  |  |
Outstanding at beginning of period (in shares) | 662,479 | 632,730 | 276,782
Granted/Vested (in shares) | 63,977 | 159,831 | 462,790
Delivered (in shares) | (53,878) | (121,764) | (95,098)
Forfeited (in shares) |  | (8,318) | (11,744)
Outstanding at end of period (in shares) | 672,578 | 662,479 | 632,730
Weighted Average Grant Date Fair Value |  |  |
Outstanding at beginning of period (in dollars per share) | $ 29.06 | $ 27.03 | $ 21.95
Granted/Vested (in dollars per share) | 35.64 | 30.37 | 29.32
Delivered (in dollars per share) | 23.11 | 20.31 | 23.62
Forfeited (in dollars per share) |  | 28.14 | 24.69
Outstanding at end of period (in dollars per share) | $ 29.54 | $ 29.06 | $ 27.03
Total Fair Value of Vested Shares |  |  |
Delivered | $ 1,774 | $ 3,751 | $ 2,519
Director |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation costs not yet recognized | $ 280 |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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