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Property and equipment, net - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 29, 2025
Mar. 31, 2026
Mar. 29, 2025
Property, Plant and Equipment [Abstract]        
Depreciation $ 0.4 $ 0.0 $ 0.7 $ 0.0