Employee Retirement Plans - Employee Defined Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jul. 02, 2022
Change in projected benefit obligation:
Benefit obligation at beginning of year	$ 1.2
Benefit obligation at end of year	1.0	$ 1.2
Changes in benefit obligations and plan assets recognized in other comprehensive income:
Settlement loss	(0.1)	0.0
Foreign Plan
Change in projected benefit obligation:
Benefit obligation at beginning of year	24.8	17.5
Assumed pension liability in Japan in connection with NeoPhotonics acquisition	0.0	2.2
Service cost	1.9	1.7	$ 1.8
Interest cost	0.4	0.3	0.1
Plan participants’ contributions	1.1	0.8
Actuarial losses (gains)	0.4	0.6
Net benefits payment	(3.3)	1.0
Plan amendments	(0.1)	(0.1)
Foreign exchange impact	(0.7)	0.8
Benefit obligation at end of year	24.5	24.8	17.5
Change in plan assets:
Fair value of plan assets at beginning of year	13.4	9.8
Actual return on plan assets	0.8	(0.5)
Employer contribution	3.1	1.5
Plan participants’ contribution	1.1	0.8
Net benefits payment	(3.3)	1.0
Foreign exchange impact	(0.2)	0.8
Fair value of plan assets at end of year	14.9	13.4	$ 9.8
Funded status	(9.6)	(11.4)
Changes in benefit obligations and plan assets recognized in other comprehensive income:
Prior service cost	0.0	0.0
Amortization of accumulated net actuarial loss	0.0	0.0
Net actuarial loss (gain)	(0.1)	1.4
Total of other comprehensive (income) loss, defined benefit plan	(0.2)	1.4
Accumulated benefit obligation	19.6	20.0
Non-current portion of the projected benefit obligation	$ 8.6	$ 10.2