v3.24.0.1
Net sales - Disaggregation of Revenue (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales SFr 1,792.1 SFr 1,222.1 SFr 724.6
Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   1,222.1 724.6
Europe, Middle East and Africa      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 488.7 378.1 264.3
Europe, Middle East and Africa | Revision of prior period, reclassification, adjustment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   23.8 3.9
Europe | Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   354.3 260.4
thereof Switzerland      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 46.0 51.5 55.1
thereof Switzerland | Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   51.5 55.1
Americas      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 1,162.2 763.8 417.6
Americas | Revision of prior period, reclassification, adjustment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   25.3 8.1
thereof the United States      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 1,082.1 718.5 396.3
North America | Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   738.5 409.5
Asia-Pacific      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 141.1 80.2 42.7
Asia-Pacific | Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   80.2 42.7
Rest of World | Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   49.1 12.0
Rest of World | Revision of prior period, reclassification, adjustment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   49.1 12.0
Shoes      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 1,711.4 1,167.5 683.3
Apparel      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 68.9 47.3 36.3
Accessories      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 11.8 7.4 5.0
Wholesale      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 1,120.3 777.0 448.8
Direct-to-Consumer      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales SFr 671.8 SFr 445.1 SFr 275.8