Revenues from contracts with customers - Schedule of Revenues by End Market and Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 27, 2026	Mar. 28, 2025	Mar. 27, 2026	Mar. 28, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 1,214,293	$ 871,799	$ 3,325,309	$ 2,509,635
Product concentration risk \| Revenue from contract with customer benchmark
Disaggregation of Revenue [Line Items]
Revenues, percentage	100.00%	100.00%	100.00%	100.00%
Optical communications
Disaggregation of Revenue [Line Items]
Revenues	$ 888,704	$ 657,231	$ 2,468,190	$ 1,930,696
Optical communications \| Product concentration risk \| Revenue from contract with customer benchmark
Disaggregation of Revenue [Line Items]
Revenues, percentage	73.20%	75.40%	74.20%	76.90%
Optical communications \| Telecom
Disaggregation of Revenue [Line Items]
Revenues	$ 431,366	$ 302,736	$ 1,179,334	$ 776,373
Optical communications \| Datacom
Disaggregation of Revenue [Line Items]
Revenues	260,442	251,105	811,680	879,087
Optical communications \| Datacenter interconnect
Disaggregation of Revenue [Line Items]
Revenues	196,896	103,390	477,176	275,236
Non-optical communications
Disaggregation of Revenue [Line Items]
Revenues	$ 325,589	$ 214,568	$ 857,119	$ 578,939
Non-optical communications \| Product concentration risk \| Revenue from contract with customer benchmark
Disaggregation of Revenue [Line Items]
Revenues, percentage	26.80%	24.60%	25.80%	23.10%
Non-optical communications \| Automotive
Disaggregation of Revenue [Line Items]
Revenues	$ 115,499	$ 129,468	$ 354,403	$ 336,456
Non-optical communications \| High-performance computing
Disaggregation of Revenue [Line Items]
Revenues	106,746		207,705
Non-optical communications \| Industrial laser
Disaggregation of Revenue [Line Items]
Revenues	44,171	40,464	125,282	113,332
Non-optical communications \| Others
Disaggregation of Revenue [Line Items]
Revenues	$ 59,173	$ 44,636	$ 169,729	$ 129,151