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Equity - Description of Lumentum Stock-Based Benefit Plans Narrative (Details) - shares
3 Months Ended 12 Months Ended
Sep. 26, 2020
Jun. 27, 2015
Jun. 27, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line items]      
Shares of common stock available for grant (in shares) 2,300,000   3,500,000
Full Value Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line items]      
Stock options issued and outstanding (in shares) 2,600,000    
2015 Plan | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line items]      
Shares of common stock available for grant (in shares) 2,300,000    
2015 Plan | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line items]      
Vesting period 3 years    
2015 Plan | RSUs | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line items]      
Vesting period 1 year    
2015 Plan | RSUs | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line items]      
Vesting period 4 years    
2015 Plan | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line items]      
Vesting period 3 years    
2015 Purchase Plan | Employee stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line items]      
Shares of common stock available for grant (in shares) 1,800,000    
Discount rate provided under purchase plan (as a percent)   15.00%  
Look-back period   6 months  
Common stock authorized for issuance under plan (in shares)   3,000,000.0  
Oclaro | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line items]      
Shares unvested to restricted stock units (in shares) 200,000