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Basis of Presentation - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	Aug. 01, 2015	Jul. 01, 2017	Jul. 02, 2016	Jun. 27, 2015	Mar. 03, 2017
Lumentum Separation
Percentage of outstanding shares distributed	80.10%
Stock conversion ratio in distribution	0.2
Restricted Cash
Restricted cash		$ 11.2	$ 12.2
Long-term restricted cash balances		6.8	6.0
Advertising Expense
Advertising cost during the period		$ 2.1	$ 2.6	$ 1.7
Customer A - OSP customer | Customer Concentration Risk | Accounts receivable, net
Concentration of Credit and Other Risks
Concentration risk percentage, more than		10.00%	10.00%
Lumentum
Lumentum Separation
Percentage of outstanding shares distributed	80.10%
Ownership percentage	19.90%
Building and improvements | Minimum
Property, Plant and Equipment
Estimated useful lives		10 years
Building and improvements | Maximum
Property, Plant and Equipment
Estimated useful lives		50 years
Machinery and equipment | Minimum
Property, Plant and Equipment
Estimated useful lives		2 years
Machinery and equipment | Maximum
Property, Plant and Equipment
Estimated useful lives		20 years
Furniture and fixtures | Minimum
Property, Plant and Equipment
Estimated useful lives		2 years
Furniture and fixtures | Maximum
Property, Plant and Equipment
Estimated useful lives		5 years
Software | Minimum
Property, Plant and Equipment
Estimated useful lives		2 years
Software | Maximum
Property, Plant and Equipment
Estimated useful lives		5 years
Office equipment | Minimum
Property, Plant and Equipment
Estimated useful lives		2 years
Office equipment | Maximum
Property, Plant and Equipment
Estimated useful lives		5 years
Demonstration units | Minimum
Property, Plant and Equipment
Estimated useful lives		3 years
Demonstration units | Maximum
Property, Plant and Equipment
Estimated useful lives		5 years
Convertible Debt | 0.625% Senior Convertible Notes
Fair Value of Financial Instruments
Interest rate on senior convertible notes		0.625%
Convertible Debt | 1.00% Senior Convertible Notes
Fair Value of Financial Instruments
Interest rate on senior convertible notes		1.00%			1.00%

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