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Convertible Redeemable Preferred Stock and Stockholders' Equity (Deficit) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 24, 2025
Jul. 24, 2024
USD ($)
$ / shares
shares
Jul. 23, 2024
USD ($)
Jun. 27, 2024
Dec. 26, 2023
Jun. 15, 2023
Mar. 10, 2021
USD ($)
shares
Oct. 14, 2019
shares
Jun. 23, 2019
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
Dec. 20, 2023
Share-based Compensation Arrangement by Share-based Payment Award                          
Convertible redeemable preferred stock, net of issuance costs (in shares) | shares   13,257,294               13,257,294 [1]      
Convertible redeemable preferred stock, net of issuance costs [1]                   $ 19,585      
Dividend rate (percent)   7.50%         7.50%            
Preferred stock cumulative dividend rate (percent)                     9.50%    
Deferred dividend rate (percent) 0.095     0.095 0.095 0.095              
Dividends payable   $ 32,800                 $ 22,900    
Preferred stock, convertible, shares issuable (in shares) | shares   662,862                      
Preferred stock, convertible, conversion price (in dollars per share) | $ / shares   $ 49.438                      
Preferred stock, special dividend threshold   $ 47,000 $ 100,000               47,000    
Liquidation preference   $ 32,800                      
Temporary equity, initial fair value net of issuance costs                     19,600 $ 19,600  
Convertible redeemable preferred stock, net of issuance costs                   $ 13,017 [1] $ 13,000 $ 13,000  
Shares converted (in shares) | shares                     0    
Common stock warrants exercised (in shares) | shares               136,425          
Number of securities called by warrants or rights (in shares) | shares                 272,851        
Price of warrants (in dollars per share) | $ / shares                 $ 15.83        
Warrants liability                          
Share-based Compensation Arrangement by Share-based Payment Award                          
Number of securities called by warrants or rights (in shares) | shares               136,425          
Private Placement                          
Share-based Compensation Arrangement by Share-based Payment Award                          
Convertible redeemable preferred stock, net of issuance costs (in shares) | shares             82,527,609            
Gross proceeds             $ 204,000            
Convertible redeemable preferred stock, net of issuance costs             $ 187,900            
Conversion ratio (in shares)                     0.054829   0.05
Conversion ratio upon payment of accrued dividends (in shares)                     0.05    
Sale of stock (in shares) | shares                 136,425        
Sale price per share (in dollars per share) | $ / shares                 $ 146.60        
Gross proceeds from sale                 $ 20,000        
Private Placement | Warrants liability                          
Share-based Compensation Arrangement by Share-based Payment Award                          
Exercisable period (in years)                 5 years        
[1] Transactions for these line items were exclusively with related parties. Refer to Footnote 5, Convertible Redeemable Preferred Stock and Stockholders' Equity (Deficit) and Footnote 9, Related Party Transactions.