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Stock-Based Compensation and Stock Plans - Description of Lumentum Stock-Based Benefit Plans and Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 04, 2016
Dec. 30, 2017
Dec. 31, 2016
Dec. 30, 2017
Dec. 31, 2016
Jul. 01, 2017
Aug. 02, 2015
Jun. 23, 2015
Stock-Based Compensation                
Common stock authorized for issuance under plan (in shares)               8,500,000
Common stock reserved for future issuance (in shares)             2,100,000  
Increase in number of shares that may be issued 3,000,000              
Shares of common stock available for grant (in shares)   5,700,000   5,700,000   6,600,000    
Impact on the entity's results of operations of recording stock-based compensation by function                
Stock-based compensation cost   $ 14.8 $ 9.1 $ 24.1 $ 16.9      
Stock-based compensation capitalized to inventory       1.7   $ 1.8    
Cost of sales                
Impact on the entity's results of operations of recording stock-based compensation by function                
Stock-based compensation cost   4.4 2.1 7.1 4.1      
Research and development                
Impact on the entity's results of operations of recording stock-based compensation by function                
Stock-based compensation cost   3.8 3.0 6.9 5.8      
Selling, general and administrative                
Impact on the entity's results of operations of recording stock-based compensation by function                
Stock-based compensation cost   $ 6.6 4.0 $ 10.1 7.0      
Full Value Awards - Total                
Stock-Based Compensation                
Stock options and Full Value Awards issued and outstanding (in shares)   2,300,000   2,300,000        
Full Value Awards - Total | Minimum                
Stock-Based Compensation                
Vesting period       1 year        
Full Value Awards - Total | Maximum                
Stock-Based Compensation                
Vesting period       4 years        
Options                
Stock-Based Compensation                
Shares of common stock available for grant (in shares)   5,700,000   5,700,000        
Options | Minimum                
Stock-Based Compensation                
Vesting period       3 years        
Stock awards expiration period       5 years        
Options | Maximum                
Stock-Based Compensation                
Vesting period       4 years        
Stock awards expiration period       10 years        
2015 Purchase Plan                
Stock-Based Compensation                
Common stock authorized for issuance under plan (in shares)               3,000,000.0
Shares of common stock available for grant (in shares)   2,400,000   2,400,000        
Discount rate provided under purchase plan (as a percent)       15.00%        
Look-back period       6 months        
Impact on the entity's results of operations of recording stock-based compensation by function                
Stock-based compensation cost   $ 0.8 $ 0.7 $ 1.6 $ 1.2      
Restricted Stock Units                
Stock-Based Compensation                
Granded awards (in shares)       1,000,000        
Restricted Stock Units | Minimum                
Stock-Based Compensation                
Vesting period       1 year        
Restricted Stock Units | Maximum                
Stock-Based Compensation                
Vesting period       4 years        
Restricted Stock                
Stock-Based Compensation                
Granded awards (in shares)       0        
Restricted Stock | Minimum                
Stock-Based Compensation                
Vesting period       1 year        
Restricted Stock | Maximum                
Stock-Based Compensation                
Vesting period       4 years        
Performance Stock Units                
Stock-Based Compensation                
Vesting period       3 years        
Granded awards (in shares)       116,788        
Impact on the entity's results of operations of recording stock-based compensation by function                
Stock-based compensation cost       $ 1.2