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Liquidity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 28, 2025
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2025
Oct. 31, 2024
Sep. 30, 2025
Aug. 20, 2025
Jan. 31, 2025
Dec. 31, 2023
Nov. 30, 2023
Accounting Policies [Line Items]                    
Net income (loss) attributable to common stockholders   $ 76.5 $ (18.9) $ 24.0 $ (56.5)          
Gains on restructuring of debt   96.3 0.0 96.3 0.0          
Accumulated deficit   (1,099.0)   (1,099.0)       $ (1,123.0)    
Net cash (used in) provided by operating activities       (3.6) 11.5          
Net cash (used in) provided by investing activities       (42.9) (20.8)          
Cash and cash equivalents   50.7 $ 74.1 50.7 74.1     77.4    
Long-term debt, net   159.1   159.1       333.7    
Proceeds from issuance of common stock       12.5 $ 0.0          
Common Class A | Rights Offering Backstop Commitment                    
Accounting Policies [Line Items]                    
Proceeds from issuance of common stock $ 12.5                  
Term Loan                    
Accounting Policies [Line Items]                    
Long-term debt 149.5                  
2023 Amended Temasek Facility                    
Accounting Policies [Line Items]                    
Liquidity maintenance covenant             $ 15.0 $ 30.0 $ 30.0 $ 50.0
Existing Credit Agreement | Term Loan                    
Accounting Policies [Line Items]                    
Gains on restructuring of debt 11.6 96.3   96.3            
Long-term debt $ 100.0                  
Existing Credit Agreement | Term Loan | Common Class A                    
Accounting Policies [Line Items]                    
Shares issued for exchange (in shares) 26,175,193                  
New Credit Agreement                    
Accounting Policies [Line Items]                    
Liquidity maintenance covenant   $ 15.0   $ 15.0   $ 30.0        
New Credit Agreement | Term Loan                    
Accounting Policies [Line Items]                    
Long-term debt $ 120.0                  
New Credit Agreement | Term Loan | New Money Term Loans                    
Accounting Policies [Line Items]                    
Long-term debt $ 20.0