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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Oct. 02, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes in goodwill
The following table presents our goodwill balance by reportable segments as of October 2, 2021 and July 3, 2021 (in millions):
Optical CommunicationsCommercial LasersTotal
Balance as of October 2, 2021 and July 3, 2021$363.5 $5.4 $368.9 
Acquired developed technology and other intangibles
The following tables present details of our other intangibles as of the periods presented (in millions, except for weighted average remaining amortization period):
October 2, 2021Gross Carrying AmountsAccumulated AmortizationNet Carrying AmountsWeighted average remaining amortization period (years)
Acquired developed technologies$390.3 $(254.9)$135.4 2.8
Customer relationships 145.0 (60.6)84.4 5.2
Order backlog22.0 (22.0)— —
Other intangibles2.7 (2.7)— —
Total intangible assets$560.0 $(340.2)$219.8 
July 3, 2021Gross Carrying AmountsAccumulated AmortizationNet Carrying AmountsWeighted average remaining amortization period (years)
Acquired developed technologies$390.3 $(238.6)$151.7 3.0
Customer relationships 145.0 (55.5)89.5 5.4
Order backlog22.0 (22.0)— —
Other intangibles2.7 (2.7)— —
Total intangible assets $560.0 $(318.8)$241.2 
Details of amortization expense
The following table presents details of amortization for the periods presented (in millions):
Three Months Ended
October 2, 2021September 26, 2020
Cost of sales$15.8 $15.0 
Selling, general and administrative5.6 5.7 
Total amortization of intangibles$21.4 $20.7 
Estimated future amortization expense
Based on the carrying amount of our acquired developed technologies and other intangibles as of October 2, 2021, and assuming no future impairment of the underlying assets, the estimated future amortization is as follows (in millions):
Fiscal Years
Remainder of 2022$63.9 
202361.9 
202440.5 
202527.7 
202618.1 
Thereafter7.7 
Total future amortization$219.8