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Balance sheet Components - Narrative (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 28, 2024
Sep. 27, 2025
Sep. 28, 2024
Sep. 30, 2023
Business Combination [Line Items]        
Inventory write down   $ 41.2 $ 33.3  
Depreciation expense   49.6 46.4 $ 42.7
Fixed asset, disposal   35.6 59.9 21.3
Accumulated depreciation and amortization   28.8 55.5 21.1
Loss on disposal   6.8 4.4 0.0
Amortization expenses   3.6 3.5 $ 3.7
Deferred revenue recognized   $ 80.5 $ 81.5  
Mayht Holding Bv Member | In Process Research and Development        
Business Combination [Line Items]        
Provisional information, adjustment, intangibles $ 73.8      
Finite-lived intangible asset, useful life 7 years