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STOCK-BASED COMPENSATION, NARRATIVE (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proceeds from exercise of stock options       $ 0 $ 724 $ 1,200
Performance Shares, Subject to Performance Conditions            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares) [1]       69,305 61,576 78,574
Deferred compensation related to unvested performance shares, period       2 years    
Performance share awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares) [1]       115,480 102,790 147,728
Deferred compensation related to unvested restricted and performance shares       $ 3,000    
Weighted average grant date fair value (in dollars per share)       $ 27.37 $ 28.25 $ 20.28
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares)       41,909 61,972 33,356
Deferred compensation related to unvested restricted and performance shares       $ 714    
Deferred compensation related to unvested performance shares, period       2 years   3 years
Weighted average grant date fair value (in dollars per share)       $ 30.03 $ 29.41 $ 22.78
Vesting September 2017 | Performance Shares, Market Condition Award            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares) [1]       46,175 41,214  
Vesting September 2017 | Performance Shares, Subject to Performance Conditions            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted and expected to be distributed (in shares)       38,789 34,622  
Vesting Annually Over a Three Year Period Beginning in September 2015 | Performance Shares, Subject to Performance Conditions            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted and expected to be distributed (in shares)       30,516 26,954  
Award vesting period       3 years   3 years
Vesting September 2016 | Performance Shares, Market Condition Award            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares) [1]           69,154
Vesting September 2016 | Performance Shares, Subject to Performance Conditions            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted and expected to be distributed (in shares)           50,480
Vesting Annually Over a Three Year Period Beginning in September 2014 | Performance Shares, Subject to Performance Conditions            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted and expected to be distributed (in shares)           28,094
Vesting Annually Over a Three Year Period Beginning in October 2015 | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares)         48,542  
Award vesting period         3 years  
Vesting October 2015 | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares)         10,236  
Vesting September 2015 | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares)         3,194  
Vesting Annually over a Three Year Period Beginning in October 2014 | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares)           33,356
Employee            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future issuance (in shares)       2,600,000    
Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future issuance (in shares)       4,223    
Compensation costs not yet recognized       $ 225    
Director | Scheduled to Vest Immediately            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares) 27,481 26,122 31,696      
Weighted average grant date fair value (in dollars per share) $ 32.75 $ 30.63 $ 22.40      
[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.