Description of Business and Summary of Significant Accounting Policies (Details)		12 Months Ended
	Aug. 01, 2015 shares	Jul. 02, 2016 USD ($) customer	Jun. 27, 2015 USD ($) customer	Jun. 28, 2014 USD ($)
Property, Plant and Equipment
Percentage of outstanding shares distributed	80.10%
Conversion of prior shares of JDSU to Lumentum (in shares) | shares	0.2
Ownership percentage	19.90%
Goodwill
Minimum percentage of likelihood that event occurrence is considered more likely than not		50.00%
Concentration of Credit and Other Risks and Allowance for Doubtful Accounts
Number of major customers for accounts receivable, net | customer		0	0
Rolling period for determination of material requirements		12 months
Foreign exchange gains (losses), net		$ (900,000)	$ (300,000)	$ 1,600,000
Asset Retirement Obligations
Asset retirement obligations included in other current liabilities		0	300,000
Asset retirement obligations included in other non-current liabilities		$ 2,300,000	$ 1,800,000
Minimum | Building and improvements
Property, Plant and Equipment
Estimated useful lives		10 years
Minimum | Machinery and equipment
Property, Plant and Equipment
Estimated useful lives		3 years
Minimum | Furniture and fixtures
Property, Plant and Equipment
Estimated useful lives		2 years
Minimum | Software
Property, Plant and Equipment
Estimated useful lives		2 years
Minimum | Office equipment
Property, Plant and Equipment
Estimated useful lives		2 years
Maximum | Building and improvements
Property, Plant and Equipment
Estimated useful lives		50 years
Maximum | Machinery and equipment
Property, Plant and Equipment
Estimated useful lives		5 years
Maximum | Furniture and fixtures
Property, Plant and Equipment
Estimated useful lives		5 years
Maximum | Software
Property, Plant and Equipment
Estimated useful lives		5 years
Maximum | Office equipment
Property, Plant and Equipment
Estimated useful lives		5 years