v3.26.1
EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jul. 31, 2025
Sep. 30, 2028
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2026
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined contribution plan, employer discretionary contribution amount     $ 10,372 $ 8,343 $ 8,038  
Defined contribution plan, employer contributions from excess assets from replacement plan     1,525      
Benefit obligation     6,527      
Other comprehensive income, net     4,063      
Benefit expense     $ 1,071      
Cost of benefits annual increase rate (as a percent)     7.50%      
Defined benefit plan, period (in years)     3 years      
Implementation charges     $ 1,016      
Postemployment benefits liability     $ 748 $ 821    
Weighted average discount rate     5.60%      
Discount rate     4.80% 5.70% 5.30%  
Non-service cost components of net periodic cost (benefit)     $ (3,848) $ 662 $ 875  
Completion period of service     1 year      
Maximum compensation of proportion     $ 330      
Allocated shares (in shares)     3,977,753 4,234,713    
Employee stock ownership plan (ESOP), compensation expense     $ 0 $ 8,533 20,583  
Employee stock ownership plan (ESOP), deferred shares, fair value       1,250    
Change in discount rate     10.00%      
Tax benefit for amortization of pension cost     $ (857) $ 97 97  
Forecast            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Cost of benefits annual increase rate (as a percent)   6.60%        
Implementation charges           $ 5,362
Clopay AMES Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined benefit plans, estimated future employer catch up contributions in next fiscal year     0      
Hunter Fan Pension Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined benefit plans, estimated future employer catch up contributions in next fiscal year     $ 0      
Other Postretirement Benefits Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Weighted average discount rate     4.85% 4.66%    
Total accumulated other comprehensive loss, net of tax     $ 181 $ 186    
Pension and other postretirement benefit expense     8 26 25  
Pension Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Benefit obligation     0 17,067 $ 16,099  
Implementation charges     $ 0 $ 5,208    
Weighted average discount rate     0.00% 5.70%    
Total accumulated other comprehensive loss, net of tax     $ 0 $ (1,761)    
Discount rate     5.70% 5.30% 5.30%  
Supplemental Employee Retirement Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Benefit obligation     $ 9,568 $ 10,173 $ 10,308  
Implementation charges     $ 0 $ 0    
Weighted average discount rate     4.24% 4.19%    
Total accumulated other comprehensive loss, net of tax     $ 5,303 $ 3,094    
Discount rate     4.44% 5.23% 5.01%  
Defined benefit plans, estimated future employer contributions in next fiscal year     $ 1,765      
Hunter Fan Pension Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Lump sum distribution for plan termination     4,830      
Plan assets, decrease for assets transferred from plan $ 6,100   10,859      
Defined benefit plan, gain (loss) from plan termination     $ 2,181