Annual report pursuant to Section 13 and 15(d)

SHARE-BASED PAYMENTS - Narrative (Details)

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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based compensation, aggregate disclosures [Abstract]      
Proceeds from the exercise of stock options $ 0 $ 14 $ 6,406
All Plans      
Share-based compensation, aggregate disclosures [Abstract]      
Total stock-based compensation cost 13,460 14,562 10,612
Future income tax benefit from compensation expense recognized 2,826 5,534 4,139
Proceeds from the exercise of stock options   14 6,406
Tax benefit realized from options exercised   $ 3 $ 932
Options vested (in shares)   0  
All Plans | Restricted Stock      
Share-based compensation, aggregate disclosures [Abstract]      
Unrecognized compensation cost on unvested awards $ 6,190    
Weighted average period of recognition of unrecognized compensation cost on non-vested awards 1 year 6 months    
All Plans | Restricted Stock | Minimum      
Share-based compensation, aggregate disclosures [Abstract]      
Expiration period (in years) 3 years    
All Plans | Restricted Stock | Maximum      
Share-based compensation, aggregate disclosures [Abstract]      
Expiration period (in years) 5 years    
2012 Equity Incentive Plan      
Share-based compensation, aggregate disclosures [Abstract]      
Term of plan (in years) 10 years    
Maximum number of shares available for grants or awards (in shares) 1,700,000    
Shares reserved for future issuance under award plan (in shares) 1,700,000    
Retirement Eligible Employees      
Share-based compensation, aggregate disclosures [Abstract]      
Total stock-based compensation cost $ 2,850 $ 3,337  
Director Fee Plans      
Director Fee Plan, aggregate disclosures [Abstract]      
Shares deferred under the director fee plan (in shares) 22,745    
Value of annual stock-based grant $ 125    
Option awards outstanding and vested (in shares) 0    
Total restricted stock awards granted to date (in shares) 173,229    
Restricted stock awards unvested (in shares) 20,940    
Director Fee Plans | Stock Options      
Director Fee Plan, aggregate disclosures [Abstract]      
Total stock options granted to date (in shares) 22,300    
2014 Director Fee Plan      
Share-based compensation, aggregate disclosures [Abstract]      
Shares reserved for future issuance under award plan (in shares) 150,000    
Director Fee Plan, aggregate disclosures [Abstract]      
Annual retainer fee paid to non-employee directors $ 85    
Annual retainer fee paid to non-employee chairman of the board $ 185    
Total restricted stock awards granted to date (in shares) 70,079