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Subsequent events (Details) - Major acquisition - Forecast - USD ($)
$ / shares in Units, $ in Millions
Aug. 31, 2026
Sep. 30, 2025
LumiThera, Inc    
Disclosure of non-adjusting events after reporting period [line items]    
Percentage of outstanding equity acquired   100.00%
Acquisition, cash transferred   $ 132
Acquisition consideration   $ 140
STAAR Surgical Company    
Disclosure of non-adjusting events after reporting period [line items]    
Acquisition consideration $ 1,500  
Acquisition consideration, per share (in dollars per share) $ 28.00