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Business Combinations - Consideration Transferred (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 10, 2018
Jul. 03, 2021
Jun. 27, 2020
Jun. 29, 2019
Business Acquisition        
Lumentum common shares issued to Oclaro stockholders   $ 0.0 $ 0.0 $ 460.1
Oclaro        
Business Acquisition        
Cash paid for outstanding Oclaro common stock $ 964.8      
Common stock issued (in shares) 10,941,436      
Common stock issued (in dollars per share) $ 41.80      
Lumentum common shares issued to Oclaro stockholders $ 457.4      
Replacement equity awards for Oclaro equity awards 2.7      
Total consideration $ 1,424.9