Revenues - Revenues by End Market (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 27, 2020	Mar. 29, 2019	Mar. 27, 2020	Mar. 29, 2019
Revenue from External Customer [Line Items]
Revenues	$ 411,210	$ 398,951	$ 1,236,723	$ 1,179,208
Revenues, percentage	100.00%	100.00%	100.00%	100.00%
Optical communications
Revenue from External Customer [Line Items]
Revenues	$ 308,566	$ 298,139	$ 933,013	$ 884,454
Revenues, percentage	75.00%	74.70%	75.40%	75.00%
Lasers, sensors, and other
Revenue from External Customer [Line Items]
Revenues	$ 102,644	$ 100,812	$ 303,710	$ 294,754
Revenues, percentage	25.00%	25.30%	24.60%	25.00%