v3.26.1
Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 17, 2026
Jun. 27, 2026
Mar. 28, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Mar. 26, 2026
Dec. 27, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Expected term         10 months 24 days      
Expected volatility rate         45.00%      
Risk free interest rate         3.76%      
Expected dividend rate         0.00%      
Incremental compensation expense $ 1.5   $ 23.8          
Reformation Inc. | Permira                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Ownership percentage   50.00%     50.00%      
Nonqualified Stock Options | SBC Plan                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Shares reserved for issuance (in shares)   6,724,960     6,724,960      
Shares outstanding (in shares)   5,838,178     5,838,178      
Common stock reserved for future issuance (in shares)   886,782     886,782      
Time-Based Options                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Grants, percentage             50.00%  
Award vesting period         4 years      
Aggregate fair value   $ 25.3     $ 25.3      
Stock-based compensation expense   1.8   $ 0.3 25.9 $ 0.6    
Unrecognized compensation cost   $ 1.5     $ 1.5      
Time-Based Options | Share-Based Payment Arrangement, Tranche One                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Award vesting period         1 year      
Award vesting rights, percentage         25.00%      
Time-Based Options | Share-Based Payment Arrangement, Tranche Two Through Four                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Award vesting period         36 months      
Award vesting rights, percentage         75.00%      
Time-Based Options | SBC Plan                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Shares outstanding (in shares)   5,838,178     5,838,178     2,987,853
Performance Shares                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Grants, percentage             50.00%  
Restricted Stock Units (RSUs)                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Forfeiture period         7 years      
Unrecognized compensation costs   $ 5.2     $ 5.2      
Maximum | Nonqualified Stock Options | SBC Plan                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Share-based compensation arrangement by share-based payment award, expiration period         10 years      
Maximum | Performance Shares                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Invested capital             250.00%  
Maximum | Restricted Stock Units (RSUs)                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Award vesting period         4 years      
Minimum | Performance Shares                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Invested capital             175.00%  
Minimum | Restricted Stock Units (RSUs)                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Award vesting period         3 years