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STOCK-BASED COMPENSATION, NARRATIVE (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Proceeds from exercise of stock options |  | $ 724 | $ 1,200 |
Performance Shares, Market Condition Award [Member] | Vesting September 2017 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted | [1] | 41,214 |  |
Performance Shares, Market Condition Award [Member] | Vesting September 2016 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted | [1] |  | 69,154 |
Performance Shares, Subject to Performance Conditions [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted | [1] | 61,576 | 78,574 |
Deferred compensation related to unvested performance shares, period |  | 2 years |  |
Performance Shares, Subject to Performance Conditions [Member] | Vesting September 2017 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted and expected to be distributed |  | 34,622 |  |
Performance Shares, Subject to Performance Conditions [Member] | Vesting Annually Over a Three Year Period Beginning in September 2015 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 3 years |  |
Number of shares granted and expected to be distributed |  | 26,954 |  |
Performance Shares, Subject to Performance Conditions [Member] | Vesting September 2016 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted and expected to be distributed |  |  | 50,480 |
Performance Shares, Subject to Performance Conditions [Member] | Vesting Annually Over a Three Year Period Beginning in September 2014 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Number of shares granted and expected to be distributed |  |  | 28,094 |
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted | [1] | 102,790 | 147,728 | 99,808
Deferred compensation related to unvested restricted and performance shares |  | $ 3,200 |  |
Weighted average fair value of shares granted (in usd per share) |  | $ 28.25 | $ 20.28 | $ 15.37
Performance Shares [Member] | Vesting September 2015 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted | [1] |  |  | 99,808
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted |  | 61,972 | 33,356 | 4,278
Deferred compensation related to unvested restricted and performance shares |  | $ 798 |  |
Deferred compensation related to unvested performance shares, period |  | 2 years | 3 years |
Weighted average fair value of shares granted (in usd per share) |  | $ 29.41 | $ 22.78 | $ 20.31
Restricted Stock [Member] | Vesting September 2015 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted |  | 3,194 |  |
Restricted Stock [Member] | Vesting Annually Over a Three Year Period Beginning in October 2015 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted |  | 48,542 |  |
Award vesting period |  | 3 years |  |
Restricted Stock [Member] | Vesting October 2015 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted |  | 10,236 |  |
Restricted Stock [Member] | Vesting Annually over a Three Year Period Beginning in October 2014 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted |  |  | 33,356 |
Restricted Stock [Member] | Vesting October 2014 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted |  |  |  | 4,278
Employee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future issuance |  | 2,893,322 |  |
Director [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future issuance |  | 31,704 |  |
Amount of expense to be recognized |  | $ 200 |  |
Director [Member] | Scheduled to Vest Immediately [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted |  | 26,122 | 31,696 | 32,524
Weighted average fair value of shares granted (in usd per share) |  | $ 30.63 | $ 22.40 | $ 19.99
[1] | The number of common shares issued related to certain performance shares may range from zero to 150 percent of the number of shares shown in the table above based on the Company's achievement of performance goals.

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