Revenues from contracts with customers - Schedule of Revenues by End Market (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 29, 2023	Dec. 30, 2022	Dec. 29, 2023	Dec. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 712,694	$ 668,656	$ 1,398,171	$ 1,324,085
Revenue from contract with customer benchmark | Geographic concentration risk
Disaggregation of Revenue [Line Items]
Revenues, percentage	100.00%	100.00%	100.00%	100.00%
Optical communications
Disaggregation of Revenue [Line Items]
Revenues	$ 567,934	$ 506,056	$ 1,101,191	$ 1,003,617
Optical communications | Revenue from contract with customer benchmark | Geographic concentration risk
Disaggregation of Revenue [Line Items]
Revenues, percentage	79.70%	75.70%	78.80%	75.80%
Automotive, lasers and other
Disaggregation of Revenue [Line Items]
Revenues	$ 144,760	$ 162,600	$ 296,980	$ 320,468
Automotive, lasers and other | Revenue from contract with customer benchmark | Geographic concentration risk
Disaggregation of Revenue [Line Items]
Revenues, percentage	20.30%	24.30%	21.20%	24.20%