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STOCK-BASED COMPENSATION - DEFERRED RETENTION STOCK/NON-EMPLOYEE DIRECTOR STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Deferred retention stock |  |  |  |
Shares |  |  |  |
Outstanding at beginning of period (in shares) | 672,578 |  | 662,479 | 632,730
Number of shares granted (in shares) | 24,167 |  | 63,977 | 159,831
Delivered (in shares) | (452,694) |  | (53,878) | (121,764)
Forfeited (in shares) | (1,969) |  |  | (8,318)
Outstanding at end of period (in shares) | 242,082 |  | 672,578 | 662,479
Weighted Average Grant Date Fair Value |  |  |  |
Outstanding at beginning of period (in dollars per share) | $ 29.54 |  | $ 29.06 | $ 27.03
Granted/Vested (in dollars per share) | 45.00 |  | 35.64 | 30.37
Delivered (in dollars per share) | 29.42 |  | 23.11 | 20.31
Forfeited (in dollars per share) | 35.56 |  |  | 28.14
Outstanding at end of period (in dollars per share) | $ 32.99 |  | $ 29.54 | $ 29.06
Total Fair Value of Vested Shares |  |  |  |
Delivered | $ 19,581 |  | $ 1,774 | $ 3,751
Director |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation costs not yet recognized | $ 264 |  |  |
Scheduled to Vest Immediately | Director |  |  |  |
Shares |  |  |  |
Number of shares granted (in shares) | 26,524 | [1] | 27,972 | 27,481
Weighted Average Grant Date Fair Value |  |  |  |
Granted (in dollars per share) | $ 39.85 |  | $ 35.59 | $ 32.75
[1] | $264,000 of expense remains as of September 30, 2018, to be recognized through December 31, 2018.

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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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