Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) - shares		3 Months Ended	12 Months Ended
	Aug. 01, 2015	Sep. 26, 2015	Jun. 27, 2015	Jun. 28, 2014
Property Plant and Equipment [Line Items]
Percentage of outstanding shares distributed	80.10%
Ownership percentage	19.90%
Fiscal period		370 days	364 days	364 days
Spin Off Transaction
Property Plant and Equipment [Line Items]
Conversion of prior shares of JDSU to Lumentum (in shares)	5