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Stock-based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended 54 Months Ended
Jan. 02, 2024
Jan. 02, 2023
Jan. 03, 2022
Jul. 12, 2021
Jul. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Depop              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period       3 years      
Precombination service awards, replacement awards       $ 4.8      
Depop | Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Deferred purchase price for post-combination share-based service arrangement       $ 44.0      
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award expiration period           10 years  
Award requisite service period           4 years  
Unrecognized compensation           $ 5.3  
Weighted-average period for unrecognized compensation           1 year 1 month 28 days  
Stock options | Board of Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award requisite service period           1 year  
Restricted stock units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award requisite service period           4 years  
Award vesting period           4 years  
Award vesting rights, percentage             25.00%
Interval vesting period           6 months  
Weighted-average period for unrecognized compensation           2 years 6 months 25 days  
Unrecognized compensation           $ 596.0  
Restricted stock units | Depop And Elo7              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Aggregate fair value of awards granted         $ 78.8    
Precombination service awards, replacement awards         $ 5.6    
Restricted stock units | Share-based Payment Arrangement, Tranche One | Depop And Elo7              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights, percentage         25.00%    
Restricted stock units | Share-based Payment Arrangement, Tranche Two | Depop And Elo7              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights, percentage         75.00%    
Financial Performance Based Restricted Stock Units | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights, percentage           0.00%  
Financial Performance Based Restricted Stock Units | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights, percentage           200.00%  
Total Shareholder Return Performance Based Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award measurement period           3 years  
2015 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Potential annual share increase (in shares)           7,050,000  
Percentage of outstanding stock           5.00%  
Maximum number of additional shares issued annually (in shares)   6,252,714 6,351,106        
Number of shares authorized (in shares)           56,644,564  
Number of shares available for grant (in shares)           37,275,895  
2015 Equity Incentive Plan | Subsequent Event              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum number of additional shares issued annually (in shares) 0