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EMPLOYEE STOCK OWNERSHIP AND PROFIT SHARING PLANS (Details)
 12 Months Ended
Oct. 01, 2020
Sep. 30, 2020
USD ($)
hours
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
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    
Eligible age for ESOP   21 years    
Employee Stock Ownership Plan (ESOP), Expense | $   $ 3,000,000.0 $ 2,900,000 $ 2,100,000
Percentage of benefits vested after credited service   100.00%    
ESOP award vesting period   7 years    
Years of credited service   7 years    
Number of shares (ESOP) released (in shares)   157,909 98,753 72,996
Fair value of shares (ESOP) released (in dollars per share) | $ / shares   $ 19.22 $ 32.61 $ 27.55
Allocated and total ESOP shares withdrawn from ESOP by participant no longer with the company (in shares)   59,865 79,926 6,687
Shares purchased for dividend reinvestment (in shares)   5,662 5,336 3,987
Year-end ESOP shares [Abstract]        
Allocated shares (in shares)   809,116 778,088 812,346
Unearned shares (in shares)   0 0 0
Total ESOP shares (in shares)   809,116 778,088 812,346
Fair value of unearned shares | $   $ 0 $ 0 $ 0
Contribution expense to profit sharing plan included in compensation and benefits | $   $ 3,100,000 $ 3,000,000.0 $ 2,200,000
Subsequent Event        
Defined Benefit Plan Disclosure [Line Items]        
Employee contributions matched 100.00%      
Percent of eligible compensation contributed 4.00%