v3.26.1
Joint Ventures (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 01, 2026
Jun. 27, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Sep. 27, 2025
Schedule of Equity Method Investments [Line Items]            
Equity in net income of consolidated affiliates   $ (1,600,000) $ 0 $ 2,400,000 $ 4,100,000  
Equity in net (loss) income of non-consolidated affiliates   (1,593,000) (404,000) 2,224,000 2,975,000  
Reversal due to acquisition $ 37,600,000          
Tax reversal due to acquisition $ 2,000,000.0          
Equity investment in affiliates   $ 27,000   27,000   $ 35,197,000
Equity investment in affiliates (Note 11)       $ 190,000 850,000  
Micro Bird Holdings Inc.            
Schedule of Equity Method Investments [Line Items]            
Equity interest in equity method investment (as a percent)   50.00%   50.00%    
Equity investment in affiliates           35,200,000
Clean Bus Solutions (CBS)            
Schedule of Equity Method Investments [Line Items]            
Equity interest in equity method investment (as a percent)   50.00%   50.00%    
Equity in net (loss) income of non-consolidated affiliates   $ 0 (400,000) $ (200,000) (1,100,000)  
Dividends       0 0  
Equity investment in affiliates           0
Equity investment in affiliates (Note 11)   0 $ 400,000 200,000 $ 900,000  
Non-cash impairment charge   7,400,000        
Carrying value of investment   $ 0   $ 0   $ 0