Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended		6 Months Ended	9 Months Ended
	Nov. 28, 2023	Nov. 17, 2023	Nov. 07, 2023	Jul. 03, 2022	Mar. 30, 2024	Apr. 01, 2023	Dec. 30, 2023	Mar. 30, 2024	Apr. 01, 2023	Jul. 01, 2023
Share-based Compensation Arrangement by Share-based Payment Award
Authorized (in shares)								3,000,000.0
Shares of common stock available for grant (in shares)					4,100,000			4,100,000		2,700,000
Share-based consideration								$ 23.5	$ 0.0
Stock-based compensation expense					$ 31.6	$ 33.1		98.3	116.3
Stock-based compensation capitalized to inventory							$ 14.2	$ 16.0
NeoPhotonics
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense									11.9
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Stock units granted (in shares)								1,900,000
Stock-based compensation cost related to awards granted to employees					153.4			$ 153.4
Estimated amortization period (in years)								2 years
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Stock units granted (in shares)								700,000
Stock-based compensation expense					$ 0.9	3.5		$ 3.6	17.0
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Authorized (in shares)		3,000,000
Unrecognized portion of tock-based compensation expense in business combination			$ 36.7
2015 Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)								4 years
2015 Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Shares outstanding (in shares)					5,000,000			5,000,000
Vesting period (in years)								3 years
Fair value of share based compensation portion of consideration				$ 40.2
Options converted (in shares)								400,000
Grant date fair value (in usd per share)								$ 93.4
2015 Plan | Restricted Stock Units | Employee
Share-based Compensation Arrangement by Share-based Payment Award
Share-based consideration				$ 3.5
2015 Plan | Restricted Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)								4 years
2015 Plan | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)								3 years
2015 Plan | Performance Stock Units | Non Executive Employee Member
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)								1 year
Stock units granted (in shares)								300,000
Fair value								$ 16.0
2015 Plan | Performance Stock Units | Director
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)								3 years
Stock units granted (in shares)								400,000
Fair value								$ 19.9
2015 Plan | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)								3 years
Shares of common stock available for grant (in shares)					4,100,000			4,100,000
2015 Purchase Plan | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award
Shares of common stock available for grant (in shares)					900,000			900,000
Discount rate provided under purchase plan (as a percent)								15.00%
Look-back period (in months)								6 months
Common stock authorized for issuance under plan (in shares)					3,000,000			3,000,000
Stock-based compensation expense					$ 1.3	$ 1.7		$ 3.6	$ 3.7
Shares issued to employees (in shares)								200,000	100,000
Cloud Light Scheme
Share-based Compensation Arrangement by Share-based Payment Award
Stock units granted (in shares)	1,100,000
Option conversion			4.375%
Granted (in usd per share)			$ 34.63
Fair value of share based compensation portion of consideration			$ 38.9
Share-based consideration			23.5
Unrecognized portion of tock-based compensation expense in business combination			$ 15.4
Vesting period (in years)			3 years
Common stock authorized for issuance under plan (in shares)	1,500,000