v3.26.1
STOCKHOLDERS’ EQUITY AND EQUITY INSTRUMENTS - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
wk
shares
Jun. 30, 2025
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of weeks for grant | wk     50  
Location, Statement of Income, Balance [Axis]: us-gaap:OtherOperatingIncomeExpenseNet        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment arrangement, expense | $ $ 0.0 $ (2.1) $ 0.0 $ (1.3)
Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment arrangement, expense | $ 3.4 $ 2.7 7.9 $ 8.6
Equity Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment arrangement, nonvested award, option, cost not yet recognized, amount | $ $ 10.4   $ 10.4  
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition     1 year 7 months 6 days  
Stock Payments        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reissued share of treasury stock (in shares)     10,719  
Deferred Stock Unit        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, non-option equity instruments, granted (in shares)     5,281  
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, non-option equity instruments, granted (in shares)     490,913  
Number of shares available from conversion (in shares) 1   1  
RSUs | Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, non-option equity instruments, granted (in shares)     33,068  
RSUs | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     1 year  
RSUs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     3 years  
Deferred Stock Units (DSUs) | Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, non-option equity instruments, granted (in shares)     16,982  
Scorecard PSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, non-option equity instruments, granted (in shares)     182,071  
Performance period     3 years  
Modifier change     20.00%  
Dividend yield     0.00%  
Scorecard PSUs | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation payment award performance percentage     0.00%  
Expected volatility     48.00%  
Risk-free rate of return     3.50%  
Scorecard PSUs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation payment award performance percentage     200.00%  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     4 years  
Number of shares available from conversion (in shares) 1   1  
Award expiration period     7 years