Operating Segments and Geographic Information - Schedule of Products and Services 10% or More of Total Net Revenue (Details) - Product concentration risk - Revenue	3 Months Ended			6 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2016
OpComms
Concentration Risk [Line Items]
Concentration risk percentage	89.00%	87.70%	89.40%	86.90%
OpComms | Telecom
Concentration Risk [Line Items]
Concentration risk percentage	27.20%	34.10%	60.50%	62.30%
OpComms | Datacom
Concentration Risk [Line Items]
Concentration risk percentage	8.50%	12.30%	25.70%	21.40%
OpComms | Consumer and Industrial
Concentration Risk [Line Items]
Concentration risk percentage	53.30%	41.30%	3.20%	3.20%
Lasers
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	12.30%	10.60%	13.10%