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Acquired Developed Technology and Other Intangibles (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 28, 2015
Mar. 29, 2014
Sep. 27, 2014
Jun. 28, 2014
Acquired developed technology and other intangibles            
Gross carrying amount of finite lived intangibles $ 743.5us-gaap_FiniteLivedIntangibleAssetsGross   $ 743.5us-gaap_FiniteLivedIntangibleAssetsGross     $ 778.2us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization (622.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   (622.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization     (607.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net carrying amount of finite lived intangibles 121.4us-gaap_FiniteLivedIntangibleAssetsNet   121.4us-gaap_FiniteLivedIntangibleAssetsNet     170.7us-gaap_FiniteLivedIntangibleAssetsNet
Net Carrying amount of in-process research and development intangibles 3.5us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill   3.5us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill     7.1us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Gross Carrying Amount 747.0us-gaap_IntangibleAssetsGrossExcludingGoodwill   747.0us-gaap_IntangibleAssetsGrossExcludingGoodwill     785.3us-gaap_IntangibleAssetsGrossExcludingGoodwill
Intangibles, net 124.9us-gaap_IntangibleAssetsNetExcludingGoodwill   124.9us-gaap_IntangibleAssetsNetExcludingGoodwill     177.8us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization expenses 15.8jdsu_FiniteLivedIntangibleAssetsAmortizedExpense 16.2jdsu_FiniteLivedIntangibleAssetsAmortizedExpense 47.0jdsu_FiniteLivedIntangibleAssetsAmortizedExpense 43.0jdsu_FiniteLivedIntangibleAssetsAmortizedExpense    
Estimated future amortization expense            
Remainder of 2015 12.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear   12.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear      
2016 37.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo   37.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo      
2017 34.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree   34.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree      
2018 22.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour   22.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour      
2019 10.9us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive   10.9us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive      
Thereafter 3.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive   3.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive      
Net carrying amount of intangibles 121.4jdsu_IntangibleAssetsNetResearchAndDevelopmentIntangibleAssetsExcludingGoodwill   121.4jdsu_IntangibleAssetsNetResearchAndDevelopmentIntangibleAssetsExcludingGoodwill      
Operating expense | Trendium            
Estimated future amortization expense            
Impairment charge     1.9us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_BusinessAcquisitionAxis
= jdsu_TrendiumIncMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
  1.9us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_BusinessAcquisitionAxis
= jdsu_TrendiumIncMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
 
Acquired developed technology            
Acquired developed technology and other intangibles            
Gross carrying amount of finite lived intangibles 529.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  529.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
    548.8us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Accumulated Amortization (456.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  (456.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
    (443.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Net carrying amount of finite lived intangibles 72.7us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  72.7us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
    105.7us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Other            
Acquired developed technology and other intangibles            
Gross carrying amount of finite lived intangibles 22.5us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
  22.5us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
    24.2us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Accumulated Amortization (21.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
  (21.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
    (22.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Net carrying amount of finite lived intangibles 1.3us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
  1.3us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
    2.1us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Customer relationships            
Acquired developed technology and other intangibles            
Gross carrying amount of finite lived intangibles 192.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  192.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
    205.2us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization (144.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  (144.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
    (142.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Net carrying amount of finite lived intangibles 47.4us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  47.4us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
    62.9us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Completed in-process research and development | Network Instruments            
Acquired developed technology and other intangibles            
Completion of in-process research and development project         $ 1.7us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease
/ us-gaap_BusinessAcquisitionAxis
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/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= jdsu_CompletedInProcessResearchAndDevelopmentMember
 
Useful life of intangible assets         52 months