v3.26.1
Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 28, 2025
Jan. 27, 2025
Jun. 27, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Sep. 28, 2025
Sep. 27, 2025
Sep. 28, 2024
Product Information [Line Items]                  
Consideration payable to customer $ 45,000     $ 45,000   $ 45,000      
Employee cost reimbursement asset $ 13,200                
Decrease in additional paid-in capital     $ (2,028,978)   $ (2,028,978)     $ (1,556,611)  
Decrease (increase) to accumulated deficit     (1,317,539)   (1,317,539)     (1,333,783)  
(Decrease) increase from continuing operations     63,482 $ (17,354) 100,200 $ (41,257)      
Related Party                  
Product Information [Line Items]                  
Decrease in accounts receivable     (2,400)   (2,400)     (2,400)  
Exol - Shared Services Agreement | Related Party                  
Product Information [Line Items]                  
Decrease in accounts receivable     (3,400)   (3,400)     (13,100)  
Walmart Advanced Systems & Robotics Inc.                  
Product Information [Line Items]                  
Consideration payable to customer   $ 45,000              
Employee cost reimbursement asset   $ 13,169              
Business combination, voting equity interest acquired, percentage 100.00%     100.00%   100.00%      
Effect of Change                  
Product Information [Line Items]                  
Decrease in additional paid-in capital             $ 8,200 8,204 $ 800
Decrease (increase) to accumulated deficit             7,100 $ 7,079 $ (700)
(Decrease) increase from continuing operations     $ (2,200) $ 10,751 $ 5,700 $ 23,999      
Effect of Change | Class A Common Stock                  
Product Information [Line Items]                  
Share price, increase (decrease), basic (in dollars per share)     $ 0   $ (0.01)        
Share price, increase (decrease), diluted (in dollars per share)     $ 0   $ 0        
Effect of Change | Exol - Shared Services Agreement | Related Party                  
Product Information [Line Items]                  
Decrease in accounts receivable             $ 5,500    
One Supplier | Cost of Goods and Service Benchmark | Supplier Concentration Risk                  
Product Information [Line Items]                  
Volume of purchases     $ 78,600   $ 202,700 $ 151,800      
Two suppliers | Cost of Goods and Service Benchmark | Supplier Concentration Risk                  
Product Information [Line Items]                  
Volume of purchases       $ 96,100