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EMPLOYEE STOCK OWNERSHIP AND PROFIT SHARING PLANS (Details)
12 Months Ended
Nov. 20, 2021
Nov. 19, 2021
Oct. 01, 2021
Sep. 30, 2021
USD ($)
hours
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
EMPLOYEE STOCK OWNERSHIP AND PROFIT SHARING PLANS [Abstract]            
Number of hours of employment required for ESOP | hours       1,000    
Years of employment to be eligible for ESOP       1 year    
Employee Stock Ownership Plan (ESOP), Expense | $       $ 3,100,000 $ 3,000,000 $ 2,900,000
Percentage of benefits vested after credited service       100.00%    
ESOP award vesting period       7 years    
Number of shares (ESOP) released (in shares)       54,985 157,909 98,753
Fair value of shares (ESOP) released (in dollars per share) | $ / shares       $ 52.48 $ 19.22 $ 32.61
Allocated and total ESOP shares withdrawn from ESOP by participant no longer with the company (in shares)       22,960 59,865 79,926
Shares purchased for dividend reinvestment (in shares)       4,192 5,662 5,336
Year-end ESOP shares [Abstract]            
Allocated shares (in shares)       787,299 809,116 778,088
Unearned shares (in shares)       0 0 0
Total ESOP shares (in shares)       787,299 809,116 778,088
Fair value of unearned shares | $       $ 0 $ 0 $ 0
Contribution expense to profit sharing plan included in compensation and benefits | $       $ 3,100,000 $ 3,100,000 $ 3,000,000
Subsequent Event            
Defined Contribution Plan Disclosure [Line Items]            
Employee contributions matched     100.00%      
Percent of eligible compensation contributed 6.00% 4.00% 6.00%