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Equity - Description of Lumentum Stock-Based Benefit Plans Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 19, 2021
Jun. 27, 2015
Jan. 01, 2022
Jul. 03, 2021
Share-based Compensation Arrangement by Share-based Payment Award        
Additional shares authorized (shares)     3,000,000.0  
Shares of common stock available for grant (in shares)     4,100,000 2,300,000
2015 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Additional shares authorized (shares) 3,000,000      
Common stock authorized for issuance under plan (in shares)     2,500,000  
Stock Options | 2015 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Shares of common stock available for grant (in shares)     4,100,000  
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted (in shares)     1,100,000  
RSUs | 2015 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period     3 years  
Granted (in shares)     1,100,000  
RSUs | 2015 Plan | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period     1 year  
RSUs | 2015 Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period     4 years  
PSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted (in shares)     200,000  
PSUs | 2015 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period     3 years  
Granted (in shares)     200,000  
Fair value     $ 16.7  
Employee stock | 2015 Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Common stock authorized for issuance under plan (in shares)   3,000,000    
Shares of common stock available for grant (in shares)     1,500,000  
Discount rate provided under purchase plan percentage   15.00%    
Look-back period   6 months