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STOCK-BASED COMPENSATION, DEFERRED RETENTION STOCK (Details) - Deferred retention stock - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Shares |  |  |
Outstanding at beginning of period (in shares) | 632,730 | 276,782 | 223,586
Granted/Vested (in shares) | 159,831 | 462,790 | 57,970
Delivered (in shares) | (121,764) | (95,098) |
Forfeited (in shares) | (8,318) | (11,744) | (4,774)
Outstanding at end of period (in shares) | 662,479 | 632,730 | 276,782
Weighted Average Grant Date Fair Value |  |  |
Outstanding at beginning of period (in dollars per share) | $ 27.03 | $ 21.95 | $ 21.69
Granted/Vested (in dollars per share) | 30.37 | 29.32 | 22.88
Delivered (in dollars per share) | 20.31 | 23.62 |
Forfeited (in dollars per share) | 28.14 | 24.69 | 21.47
Outstanding at end of period (in dollars per share) | $ 29.06 | $ 27.03 | $ 21.95
Total Fair Value of Vested Shares |  |  |
Delivered | $ 3,751 | $ 2,519 |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Grant Date Fair Value, Ending Balance + References No definition available. + Details
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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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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