Name:	jdsu_CarryingAmountOfLiabilityAndEquityComponentAbstract
Namespace Prefix:	jdsu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

Debts and Letters of Credit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified			0 Months Ended	3 Months Ended
	Sep. 27, 2014 Letter	Aug. 21, 2013	Aug. 21, 2013 Revolving Credit Facility	Sep. 27, 2014 0.625% Senior Convertible Notes	Sep. 28, 2013 0.625% Senior Convertible Notes	Jun. 28, 2014 0.625% Senior Convertible Notes	Aug. 21, 2013 0.625% Senior Convertible Notes	Aug. 15, 2013 0.625% Senior Convertible Notes	Sep. 27, 2014 0.625% Senior Convertible Notes Other non-current assets
Debt details
Conversion price of convertible debt (in dollars per share)				$ 18.83	$ 18.83		$ 18.83
Amount outstanding				$ 650.0		$ 650.0
Revolving credit facility terminated			250.0
Outstanding balance	35.5	0
Details of the Company's debt:
Principal amount of 0.625% Senior Convertible Notes				650.0		650.0
Unamortized discount of liability component				(107.5)		(113.7)
Carrying amount of liability component				542.5		536.3	515.6
Carrying amount of equity component				134.4		134.4	134.4
Interest rate on senior convertible notes (as a percent)				0.625%	0.625%	0.625%	0.625%	0.625%
Aggregate principal amount of convertible debt							650.0
Proceeds from issuance of convertible notes after issuance costs							636.3
Discount rate used to calculate the carrying value of the liability component of the convertible debt (as a percent)							5.40%
Variable rate basis on which discount rate is based				5-year swap
Effective interest rate (as a percent)				5.40%	5.40%
Remaining term of convertible notes				3 years 10 months 24 days
Deferred finance costs							13.7
Liability component, debt issuance cost							10.9
Equity component, debt issuance cost							2.8
Unamortized portion of debt issuance cost			1.3						8.7
Fair market value of convertible debt				657.1		653.0
Effective interest rate and interest expense for the contractual interest and the accretion of debt discount:
Effective interest rate (as a percent)				5.40%	5.40%
Interest expense-contractual interest				1.0	0.4
Accretion of debt discount				$ 6.2	$ 2.6
Outstanding Letters of Credit
Number of standby letters of credit	13