Viavi Solutions (VIAV) 10-Q 5 May 15 2015 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Mar. 28, 2015	Apr. 25, 2015
Document and Entity Information
Entity Registrant Name	JDS UNIPHASE CORP /CA/
Entity Central Index Key	912093
Document Type	10-Q
Document Period End Date	28-Mar-15
Amendment Flag	FALSE
Current Fiscal Year End Date	-21
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		234,147,235
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS
Net revenue	$410.70	$418	$1,281.40	$1,294.60
Cost of sales	215.5	222.3	665.3	687.5
Amortization of acquired technologies	10.9	11	32	32.3
Gross profit	184.3	184.7	584.1	574.8
Operating expenses:
Research and development	76.7	74.1	232.3	216
Selling, general and administrative	116.7	113.4	342.2	329.5
Amortization of other intangibles	4.9	5.2	15	10.7
Restructuring and related charges	8.3	3.6	20.9	3.8
Total operating expenses	206.6	196.3	610.4	560
(Loss) income from operations	-22.3	-11.6	-26.3	14.8
Interest and other income (expense), net	0.3	0.6	1.2	0.4
Interest expense	-8.6	-7.7	-25.4	-21.3
Loss before income taxes	-30.6	-18.7	-50.5	-6.1
Benefit from income taxes	-17.4	-17.2	-2.5	-13.7
Net (loss) income	($13.20)	($1.50)	($48)	$7.60
Basic net (loss) income per share from:
Basic	($0.06)	($0.01)	($0.21)	$0.03
Diluted net (loss) income per share from:
Diluted	($0.06)	($0.01)	($0.21)	$0.03
Shares used in per share calculation:
Basic	233.2	234	232.1	234.1
Diluted	233.2	234	232.1	237.7

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
Net (loss) income	($13.20)	($1.50)	($48)	$7.60
Net change in available-for-sale investments, net of tax:
Unrealized holding gains arising during period	0.1	0.1	-0.4	0.3
Net change in cumulative translation adjustment, net of tax	-27.1	-1.3	-63	8.5
Net change in defined benefit obligation, net of tax:
Amortization of actuarial losses	0.1		0.4	0.1
Net change in Accumulated other comprehensive (loss) income	-26.9	-1.2	-63	8.9
Comprehensive (loss) income	($40.10)	($2.70)	($111)	$16.50

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 28, 2015	Jun. 28, 2014
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$299.20	$297.20
Short-term investments	489.7	552.2
Restricted cash	26.6	31.9
Accounts receivable, net (Note 6)	305.3	296.2
Inventories, net	155.8	153.3
Prepayments and other current assets	80.3	78.7
Total current assets	1,356.90	1,409.50
Property, plant and equipment, net	278.1	288.8
Goodwill	258.5	267
Intangibles, net	124.9	177.8
Deferred income taxes	149.9	183.3
Other non-current assets	23.4	25.5
Total assets	2,191.70	2,351.90
Current liabilities:
Accounts payable	109.2	137.1
Accrued payroll and related expenses	59.9	79.9
Income taxes payable	12.7	21.4
Deferred revenue	76.9	77.5
Accrued expenses	35.5	34.8
Other current liabilities	41.8	57.7
Total current liabilities	336	408.4
Long-term debt	555.2	536.3
Other non-current liabilities	181.4	219.5
Commitments and contingencies (Note 15)
Stockholders' equity:
Preferred Stock, $0.001 par value; 1 million shares authorized; 1 share at March 28, 2015 and June 28, 2014, issued and outstanding
Common Stock, $0.001 par value; 1 billion shares authorized; 234 million shares at March 28, 2015 and 230 million shares at June 28, 2014, issued and outstanding	0.2	0.2
Additional paid-in capital	70,004.20	69,957
Accumulated deficit	-68,833.40	-68,780.60
Accumulated other comprehensive (loss) income	-51.9	11.1
Total stockholders equity	1,119.10	1,187.70
Total liabilities and stockholders equity	$2,191.70	$2,351.90

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 28, 2015	Jun. 28, 2014
CONSOLIDATED BALANCE SHEETS
Preferred Stock, par value (in dollars per share)	$0.00	$0.00
Preferred Stock, shares authorized	1,000,000	1,000,000
Preferred Stock, shares issued	1	1
Preferred Stock, shares outstanding	1	1
Common Stock, par value (in dollars per share)	$0.00	$0.00
Common Stock, shares authorized	1,000,000,000	1,000,000,000
Common Stock, shares issued	234,000,000	230,000,000
Common Stock, shares outstanding	234,000,000	230,000,000

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
OPERATING ACTIVITIES:
Net (loss) income	($48)	$7.60
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation expense	60.3	53.8
Amortization of acquired technologies and other intangibles	47	43
Stock-based compensation	50.3	48.3
Amortization of debt issuance costs and accretion of debt discount	20.4	16.3
Amortization of discount and premium on investments, net	2.7	3.1
Other	4.5	0.9
Changes in operating assets and liabilities, net of impact of acquisitions of businesses:
Accounts receivable	-14.3	1
Inventories	-6.7	4.8
Other current and non-current assets	-5.2	-1.5
Accounts payable	-17.6	23.2
Income taxes payable	-15.6	-0.6
Deferred revenue, current and non-current	2.4	9.3
Deferred taxes, net	13.6	-26.9
Accrued payroll and related expenses	-38.7	-33
Accrued expenses and other current and non-current liabilities	-20.6	-22.9
Net cash provided by operating activities	34.5	126.4
INVESTING ACTIVITIES:
Purchases of available-for-sale investments	-460	-885.1
Maturities of available-for-sale investments	450.2	327.7
Sales of available-for-sale investments	69.5	186.8
Changes in restricted cash	5	-1.8
Acquisition of businesses, net of cash acquired		-219.3
Capital expenditures	-68.7	-68.1
Proceeds from the sale of assets	5.2	8
Net cash provided by (used in) investing activities	1.2	-651.8
FINANCING ACTIVITIES:
Proceeds from issuance of senior convertible debt		650
Payment of debt issuance costs		-13.5
Repurchase and retirement of common stock	-4.7	-100
Payment of financing obligations	-23.1	-1.3
Proceeds from exercise of employee stock options and employee stock purchase plan	14	22
Net cash (used in) provided by financing activities	-13.8	557.2
Effect of exchange rates on cash and cash equivalents	-19.9	1.7
Net increase in cash and cash equivalents	2	33.5
Cash and cash equivalents at beginning of period	297.2	281
Cash and cash equivalents at end of period	$299.20	$314.50

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Mar. 28, 2015
Basis of Presentation
Basis of Presentation
	Note 1. Basis of Presentation
	The financial information for JDS Uniphase Corporation (“JDSU,” also referred to as “the Company”) as of March 28, 2015 and for the three and nine months ended March 28, 2015 and March 29, 2014 is unaudited, and includes all normal and recurring adjustments Company management (“Management”) considers necessary for a fair statement of the financial information set forth herein, in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, such information does not include all of the information and footnotes required by U.S. GAAP for annual financial statements. For further information, please refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended June 28, 2014.
	The balance sheet as of June 28, 2014 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The results for the three and nine months ended March 28, 2015 and March 29, 2014 may not be indicative of results for the year ending June 27, 2015 or any future periods.
	Fiscal Years
	The Company utilizes a 52-53 week fiscal year ending on the Saturday closest to June 30th. The Company’s fiscal 2015 is a 52-week year ending on June 27, 2015. The Company’s fiscal 2014 was a 52-week year ending on June 28, 2014.
	Change in Reportable Segments
	During the first quarter of fiscal 2015 the Company reorganized its Network Service and Enablement (“NSE”) reportable segment into two separate reportable segments: Network Enablement (“NE”) and Service Enablement (“SE”). This change does not impact previously reported consolidated financial information. However, historical information related to the NSE reportable segment has been recast to reflect the new NE and SE reportable segment structure. Refer to “Note 16. Operating Segments” for more information.
	JDSU Separation
	On September 10, 2014, the Company announced plans to separate into two publicly traded companies: an optical components and commercial lasers company consisting of JDSU’s current Communications and Commercial Optical Products (“CCOP”) segment, and a network and service enablement company consisting of JDSU’s current Network Enablement (“NE”), Service Enablement (“SE”) and Optical Security and Performance Products (“OSP”) segments. On February 26, 2015, the Company announced that the optical components and commercial lasers company will be named Lumentum Holdings Inc. (“Lumentum”), and the network and service enablement company will be renamed Viavi Solutions Inc. (“Viavi”) at the time of the separation. The separation is expected to occur through a tax-free pro rata spinoff of Lumentum to JDSU shareholders, though the structure is subject to change based upon various business, tax and regulatory factors. The Company expects to complete the separation by the calendar third quarter of 2015.
	Principles of Consolidation
	The consolidated financial statements have been prepared in accordance with U.S. GAAP and include the Company and its wholly-owned subsidiaries. All inter-company accounts and transactions have been eliminated.
	Use of Estimates
	The preparation of the Company’s consolidated financial statements in conformity with U.S. GAAP requires Management to make estimates and assumptions that affect the reported amount of assets and liabilities at the date of the financial statements, the reported amount of net revenue and expenses and the disclosure of commitments and contingencies during the reporting periods. The Company bases estimates on historical experience and on various assumptions about the future believed to be reasonable based on available information. The Company’s reported financial position or results of operations may be materially different under changed conditions or when using different estimates and assumptions, particularly with respect to significant accounting policies. If estimates or assumptions differ from actual results, subsequent periods are adjusted to reflect more current information.

Recently_Issued_Accounting_Pro

Recently Issued Accounting Pronouncements	9 Months Ended
	Mar. 28, 2015
Recently Issued Accounting Pronouncements
Recently Issued Accounting Pronouncements	Note 2. Recently Issued Accounting Pronouncements
	In April 2015, the Financial Accounting Standards Board (“FASB”) issued new authoritative guidance to provide a practical expedient that permits the entity to measure defined benefit plan assets and obligations using the month-end that is closest to the entity’s fiscal year-end and apply that practical expedient consistently from year to year. This guidance is effective for the Company in the first quarter of fiscal 2017 and may apply to the qualified and the non-qualified pension plans in certain countries. Prospective application is required, and early adoption is permitted. The Company is evaluating the impact of adopting this new accounting guidance on its consolidated financial statements.
	In April 2015, the FASB issued new authoritative guidance to simplify the presentation of debt issuance costs by requiring debt issuance costs to be presented as a deduction from the corresponding liability, consistent with debt discounts or premiums. This guidance is effective for the Company in the first quarter of fiscal 2017, and will be applied retrospectively. The consolidated balance sheet of each individual period presented will be adjusted to reflect the period-specific effects of applying this new guidance.
	In May 2014, the FASB issued new authoritative guidance related to revenue recognition. This guidance will replace current U.S. GAAP guidance on this topic and eliminate industry-specific guidance. The new revenue recognition guidance provides a unified model to determine when and how revenue is recognized. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. This standard allows for either full retrospective adoption or modified retrospective adoption. The Company is evaluating the effect that this new guidance will have on its consolidated financial statements and the related disclosures.
	On April 1, 2015, the FASB proposed deferring the effective date by one year to December 15, 2017 for annual reporting periods beginning after that date. The FASB also proposed permitting early adoption of the standard, but not before the original effective date of December 15, 2016. Presently, the FASB’s proposed deferral is not a final decision.
	In April 2014, the FASB issued authoritative guidance, which specifies that only disposals, such as a disposal of a major line of business, representing a strategic shift in operations should be presented as discontinued operations. In addition, the new guidance requires expanded disclosures about discontinued operations that will provide financial statement users with more information about the assets, liabilities, income, and expenses of discontinued operations. This guidance is effective for the Company in the first quarter of fiscal 2016 and may apply to the treatment of the proposed tax-free spinoff of the CCOP business expected to be completed by the third calendar quarter of 2015 (the first quarter of fiscal 2016). Early adoption is permitted but only for disposals that have not been reported in financial statements previously issued. The Company is evaluating the impact of adopting this new accounting guidance on the consolidated financial statements.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Mar. 28, 2015
Earnings Per Share
Earnings Per Share	Note 3. Earnings Per Share
	The following table sets forth the computation of basic and diluted net (loss) income per share (in millions, except per share data):
		Three Months Ended						Nine Months Ended
		March 28, 2015			March 29, 2014			March 28, 2015			March 29, 2014
	Numerator:
	Net (loss) income	$	(13.2	)	$	(1.5	)	$	(48.0	)	$	7.6
	Denominator:
	Weighted-average number of common shares outstanding:
	Basic	233.2			234			232.1			234.1
	Effect of dilutive securities from stock-based benefit plans	—			—			—			3.6
	Diluted	233.2			234			232.1			237.7
	Net (loss) income per share from:
	Basic	$	(0.06	)	$	(0.01	)	$	(0.21	)	$	0.03
	Diluted	$	(0.06	)	$	(0.01	)	$	(0.21	)	$	0.03
	The following table sets forth the weighted-average potentially dilutive securities excluded from the computation of the diluted net (loss) income per share because their effect would have been anti-dilutive (in millions):
		Three Months Ended				Nine Months Ended
		March 28, 2015		March 29, 2014		March 28, 2015		March 29, 2014
		(1)(2)		(1)(2)		(1)(2)		-2
	Employee stock options and ESPP	3.7		4.6		3.8		1.1
	RSUs	10.4		10.2		10.6		2.9
	Total potentially dilutive securities	14.1		14.8		14.4		4.0
	(1) As the Company incurred a net loss in the period, potential dilutive securities from employee stock options, employee stock purchase plan (“ESPP”) and Restricted Stock Units (“RSUs”) have been excluded from the diluted net loss per share computations as their effects were deemed anti-dilutive.
	(2) The Company’s 0.625% Senior Convertible Notes due 2033 (the “2033 Notes”) are not included in the table above. The par amount of convertible notes is payable in cash equal to the principal amount of the notes plus any accrued and unpaid interest and then the “in-the-money” conversion benefit feature at the conversion price above $18.83 per share is payable in cash, shares of the Company’s common stock or a combination of both. Refer to “Note 10. Debts and Letters of Credit” for more details.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive (Loss) Income	9 Months Ended
	Mar. 28, 2015
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive (Loss) Income	Note 4. Accumulated Other Comprehensive (Loss) Income
	The Company’s accumulated other comprehensive (loss) income consists of the accumulated net unrealized gains and losses on available-for-sale investments, foreign currency translation adjustments and defined benefit obligations.
	For the nine months ended March 28, 2015, the changes in accumulated other comprehensive (loss) income by component net of tax were as follows (in millions):
		Unrealized			Foreign currency			Defined benefit			Total
		losses on			translation			obligation, net
		available-for-			adjustments			of tax (1)
		sale investments
	Beginning balance as of June 28, 2014	$	(2.8	)	$	26.2		$	(12.3	)	$	11.1
	Other comprehensive (loss) income before reclassification adjustments	(0.4		)	(63.0		)	—			(63.4		)
	Amounts reclassified from accumulated other comprehensive (loss) income	—			—			0.4			0.4
	Net current-period other comprehensive (loss) income	(0.4		)	(63.0		)	0.4			(63.0		)
	Ending balance as of March 28, 2015	$	(3.2	)	$	(36.8	)	$	(11.9	)	$	(51.9	)
	(1) Amount represents the amortization of actuarial losses included as a component of Selling, general and administrative expense (“SG&A”) in the Consolidated Statements of Operations for the nine months ended March 28, 2015. There was no tax impact. Refer to “Note 14. Employee Defined Benefit Plans” for more details on the computation of net periodic cost for pension plans.

Mergers_and_Acquisitions

Mergers and Acquisitions	9 Months Ended
	Mar. 28, 2015
Mergers and Acquisitions
Mergers and Acquisitions	Note 5. Mergers and Acquisitions
	Holdback Payments Related to Fiscal 2014 Acquisitions
	On December 10, 2013 (“Trendium Closing Date”), the Company acquired certain technology and other assets from Trendium Inc (“Trendium”), a privately-held U.S. company, for a purchase price of $26.1 million in cash, including a holdback payment of approximately $2.5 million which was reserved for potential breaches of representations and warranties. During the second quarter of fiscal 2015, the Company made the $2.5 million holdback payment following the one-year anniversary of the Trendium Closing Date. The payment is classified as a financing activity within the Consolidated Statements of Cash Flows.
	On January 6, 2014 (“Network Instruments Closing Date”), the Company completed the acquisition of Network Instruments, LLC (“Network Instruments”) a privately-held U.S. company, for $208.5 million in cash, subject to final cash and working capital adjustments, including holdback payments of approximately $20.0 million which were reserved for potential breaches of representations and warranties. During the first quarter of fiscal 2015, the Company made the required six-month $9.8 million holdback payment, net of working capital adjustments. During the third quarter of fiscal 2015, the Company made the final holdback payment of $9.9 million, net of working capital adjustments, following the one-year anniversary of the Network Instruments Closing Date. The payments are classified as a financing activity within the Consolidated Statements of Cash Flows.

Balance_Sheet_and_Other_Detail

Balance Sheet and Other Details	9 Months Ended
	Mar. 28, 2015
Balance Sheet and Other Details
Balance Sheet and Other Details	Note 6. Balance Sheet and Other Details
	Accounts receivable reserves and allowances
	The activities and balances for allowance for doubtful accounts and allowance for sales returns were as follows (in millions):
		June 28, 2014		Charged to Costs		Adjustments (1)			March 28, 2015
				and Expenses
	Allowance for doubtful accounts	$	3	$	0.7	$	(0.7	)	$	3
	Allowance for sales returns	0.5		1.2		(1.0		)	0.7
	Total accounts receivable reserves	$	3.5	$	1.9	$	(1.7	)	$	3.7
	(1) Represents the effect of currency translation adjustments and write-offs of uncollectible accounts, net of recoveries.
	Inventories, net
	Inventories, net are stated at the lower of cost or market, and include material, labor and manufacturing overhead costs. The components of Inventories, net were as follows (in millions):
		March 28, 2015		June 28, 2014
	Finished goods	$	87.5	$	78.4
	Work in process	31.5		40.1
	Raw materials	36.8		34.8
	Inventories, net	$	155.8	$	153.3
	Prepayments and other current assets
	The components of Prepayments and other current assets were as follows (in millions):
		March 28, 2015		June 28, 2014
	Prepayments	$	34.2	$	33.3
	Other current assets	46.1		45.4
	Prepayments and other current assets	$	80.3	$	78.7
	Other current liabilities
	The components of Other current liabilities were as follows (in millions):
		March 28, 2015		June 28, 2014
	Deferred compensation plan	$	3.4	$	3.9
	Warranty	4.0		5.3
	Restructuring	18.8		14.5
	Holdback liabilities from acquisitions	2.3		22.5
	Other	13.3		11.5
	Other current liabilities	$	41.8	$	57.7
	Other non-current liabilities
	The components of Other non-current liabilities were as follows (in millions):
		March 28, 2015		June 28, 2014
	Pension and post-employment benefits	$	84.8	$	107.3
	Financing obligation	29.3		31.4
	Long-term deferred revenue	27.4		22.7
	Other	39.9		58.1
	Other non-current liabilities	$	181.4	$	219.5

Investments_and_Fair_Value_Mea

Investments and Fair Value Measurements	9 Months Ended
	Mar. 28, 2015
Investments and Fair Value Measurements
Investments and Fair Value Measurements	Note 7. Investments and Fair Value Measurements
	The Company’s investments in marketable debt and equity securities were primarily classified as available-for-sale investments.
	As of March 28, 2015, the Company’s available-for-sale securities were as follows (in millions):
		Amortized		Gross Unrealized		Gross Unrealized			Estimated
		Cost/Carrying		Gains		Losses			Fair Value
		Cost
	Debt securities:
	U.S. treasuries	$	34.9	$	—	$	—		$	34.9
	U.S. agencies	96.3		—		—			96.3
	Municipal bonds and sovereign debt instruments	11.6		—		—			11.6
	Asset-backed securities	75.3		—		(0.2		)	75.1
	Corporate securities	348.4		0.1		(0.1		)	348.4
	Total debt available-for-sale securities	$	566.5	$	0.1	$	(0.3	)	$	566.3
	The Company generally classifies debt securities as cash equivalents, short-term investments or other non-current assets based on the stated maturities; however, certain securities with stated maturities of longer than twelve months which are highly liquid and available to support current operations are also classified as short-term investments. As of March 28, 2015, of the total estimated fair value, $79.2 million was classified as cash equivalents, $486.3 million was classified as short-term investments and $0.8 million was classified as other non-current assets.
	In addition to the amounts presented above, as of March 28, 2015, the Company’s short-term investments classified as trading securities related to the deferred compensation plan were $3.4 million, of which $0.4 million was invested in debt securities, $0.7 million was invested in money market instruments and funds and $2.3 million was invested in equity securities. Trading securities are reported at fair value, with the unrealized gains or losses resulting from changes in fair value recognized in Interest and other income (expense), net.
	During the three and nine months ended March 28, 2015 and March 29, 2014, the Company recorded no other-than-temporary impairment charges in each respective period.
	As of March 28, 2015, contractual maturities of the Company’s debt securities classified as available-for-sale securities were as follows (in millions):
		Amortized		Estimated
		Cost/Carrying Cost		Fair Value
	Amounts maturing in less than 1 year	$	413.8	$	413.7
	Amounts maturing in 1 - 5 years	151.7		151.8
	Amounts maturing in more than 5 years	1.0		0.8
	Total debt available-for-sale securities	$	566.5	$	566.3
	As of June 28, 2014, the Company’s available-for-sale securities were as follows (in millions):
		Amortized		Gross Unrealized		Gross Unrealized			Estimated
		Cost/Carrying		Gains		Losses			Fair Value
		Cost
	Debt securities:
	U.S. treasuries	$	36.8	$	—	$	—		$	36.8
	U.S. agencies	70		—		—			70
	Municipal bonds and sovereign debt instruments	16.8		—		—			16.8
	Asset-backed securities	94.7		0.1		(0.2		)	94.6
	Corporate securities	370.5		0.2		—			370.7
	Total debt available-for-sale securities	$	588.8	$	0.3	$	(0.2	)	$	588.9
	As of June 28, 2014, of the total estimated fair value, $39.8 million was classified as cash equivalents, $548.3 million was classified as short-term investments and $0.8 million was classified as other non-current assets.
	In addition to the amounts presented above, as of June 28, 2014, the Company’s short-term investments classified as trading securities, related to the deferred compensation plan, were $3.9 million, of which $0.4 million was invested in debt securities, $0.7 million was invested in money market instruments and funds and $2.8 million was invested in equity securities. Trading securities are reported at fair value, with the unrealized gains or losses resulting from changes in fair value recognized in Interest and other income (expense), net.
	Fair Value Measurements
	Assets measured at fair value as of March 28, 2015 are summarized below (in millions):
		Fair Value measurement as of
		March 28, 2015
		Total		Quoted Prices in Active		Significant Other
				Markets for Identical		Observable Inputs
				Assets (Level 1)		(Level 2)
	Assets:
	Debt available-for-sale securities:
	U.S. treasuries	$	34.9	$	34.9	$	—
	U.S. agencies	96.3		—		96.3
	Municipal bonds and sovereign debt instruments	11.6		—		11.6
	Asset-backed securities	75.1		—		75.1
	Corporate securities	348.4		—		348.4
	Total debt available-for-sale securities	566.3		34.9		531.4
	Money market funds	163.0		163.0		—
	Trading securities	3.4		3.4		—
	Total assets (1)	$	732.7	$	201.3	$	531.4
	(1) $212.2 million in cash and cash equivalents, $489.7 million in short-term investments, $26.2 million in restricted cash, and $4.6 million in other non-current assets on the Company’s Consolidated Balance Sheets.
	Fair value is defined as the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. There is an established hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability and are developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the assumptions about the factors that market participants would use in valuing the asset or liability.
	The Company’s cash and investment instruments are classified within Level 1 or Level 2 of the fair value hierarchy based on quoted prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. As of June 28, 2014 and during the three and nine months ended March 28, 2015, the Company held no Level 3 investments.
	Foreign Currency Forward Contracts
	The Company has foreign subsidiaries that operate and sell the Company’s products in various markets around the world. As a result, the Company is exposed to foreign exchange risks. The Company utilizes foreign exchange forward contracts and other instruments to manage foreign currency risk associated with foreign currency denominated monetary assets and liabilities, primarily certain short-term intercompany receivables and payables, and to reduce the volatility of earnings and cash flows related to foreign-currency transactions.
	The forward contracts, most with a term of less than 120 days, were transacted near quarter end; therefore, the fair value of the contracts as of both March 28, 2015 and June 28, 2014 is not significant. The change in the fair value of these foreign currency forward contracts is recorded as gain or loss in the Company’s Consolidated Statements of Operations as a component of Interest and other income (expense), net.

Goodwill

Goodwill	9 Months Ended
	Mar. 28, 2015
Goodwill
Goodwill	Note 8. Goodwill
	The following table presents the changes in goodwill allocated to the reportable segments (in millions):
		Network			Service			Communications			Optical Security		Total
		Enablement (1)			Enablement (1)			and Commercial			and Performance
								Optical Products (2)			Products
	Balance as of June 28, 2014	$	158		$	94.8		$	5.9		$	8.3	$	267
	Currency translation adjustments	(5.1		)	(3.0		)	(0.4		)	—		(8.5		)
	Balance as of March 28, 2015	$	152.9		$	91.8		$	5.5		$	8.3	$	258.5
	(1) In the first quarter of fiscal 2015, the Company reorganized its NSE reportable segment into two separate reportable segments, NE and SE. The goodwill of NSE was allocated between the two new segments based on their relative fair value as of June 29, 2014, the first day of fiscal 2015. The Company determined that based on its cash flow structure, organizational structure and the financial information provided to and reviewed by Management, NE and SE also represented new reporting units for fiscal 2015. Refer to “Note 16. Operating Segments” for more information.
	(2) The goodwill balance as of March 28, 2015 for the CCOP segment relates to the acquisition of Time-Bandwidth and has been allocated to the Lasers reporting unit.
	The Company reviews goodwill for impairment during the fourth quarter of each fiscal year, or more frequently if events or circumstances indicate that an impairment loss may have occurred. In the fourth quarter of fiscal 2014, the Company completed the annual impairment test of goodwill with no goodwill impairments.
	As the Company reorganized its NSE segment into two reportable segments during the first quarter of fiscal 2015, the goodwill allocated to the new NE and SE reporting units was reviewed under the two-step quantitative goodwill impairment test in accordance with the authoritative guidance. Under the first step of the authoritative guidance for impairment testing, the fair value of the new reporting units was determined based on a combination of the income approach, which estimates the fair value based on the future discounted cash flows, and the market approach, which estimates the fair value based on comparable market prices. Based on the first step of the analysis, the Company determined that the fair value of each reporting unit is significantly above its carrying amount. As such, the Company was not required to perform step two of the analysis. The Company recorded no impairment charge as a result of the interim period impairment test performed during the three months ended September 27, 2014. There were no other events or changes in circumstances which triggered impairment review for any of the reporting units during the three and nine months ended March 28, 2015.

Acquired_Developed_Technology_

Acquired Developed Technology and Other Intangibles	9 Months Ended
	Mar. 28, 2015
Acquired Developed Technology and Other Intangibles
Acquired Developed Technology and Other Intangibles	Note 9. Acquired Developed Technology and Other Intangibles
	The following tables present details of the Company’s acquired developed technology, customer relationships and other intangibles (in millions):
	As of March 28, 2015	Gross Carrying		Accumulated			Net
		Amount		Amortization
	Acquired developed technology	$	529	$	(456.3	)	$	72.7
	Customer relationships	192		(144.6		)	47.4
	Other	22.5		(21.2		)	1.3
	Total intangibles subject to amortization	743.5		(622.1		)	121.4
	In-process research and development intangibles	3.5		—			3.5
	Total intangibles	$	747	$	(622.1	)	$	124.9
	As of June 28, 2014	Gross Carrying		Accumulated			Net
		Amount		Amortization
	Acquired developed technology	$	548.8	$	(443.1	)	$	105.7
	Customer relationships	205.2		(142.3		)	62.9
	Other	24.2		(22.1		)	2.1
	Total intangibles subject to amortization	778.2		(607.5		)	170.7
	In-process research and development intangibles	7.1		—			7.1
	Total intangibles	$	785.3	$	(607.5	)	$	177.8
	During the three months ended September 27, 2014, the Company completed its in-process research and development (“IPR&D) project related to the fiscal 2014 acquisition of Network Instruments. Accordingly, $1.7 million was transferred from indefinite life intangible assets to acquired developed technology intangible assets and began amortizing over its useful life of fifty-two months.
	During the three months ended December 27, 2014, the Company recorded a $1.9 million IPR&D impairment charge for an ongoing project related to the fiscal 2014 acquisition of Trendium in accordance with the authoritative accounting guidance. The charge was recorded to Research and development (“R&D”) expense in the Consolidated Statement of Operations for the nine months ended March 28, 2015.
	During the three and nine months ended March 28, 2015, the Company recorded $15.8 million and $47.0 million, respectively, of amortization expense relating to acquired developed technology, customer relationships and other intangibles.
	During the three and nine months ended March 29, 2014, the Company recorded $16.2 million and $43.0 million, respectively, of amortization expense relating to acquired developed technology, customer relationships and other intangibles.
	Based on the carrying amount of acquired developed technology, customer relationships and other intangibles as of March 28, 2015, and assuming no future impairment of the underlying assets, the estimated future amortization is as follows (in millions):
	Fiscal Years
	Remainder of 2015	$	12.0
	2016	37.8
	2017	34.7
	2018	22.2
	2019	10.9
	Thereafter	3.8
	Total amortization	$	121.4
	The acquired developed technology, customer relationships and other intangibles balance are adjusted quarterly to record the effect of currency translation adjustments.

Debts_and_Letters_of_Credit

Debts and Letters of Credit	9 Months Ended
	Mar. 28, 2015
Debts and Letters of Credit
Debts and Letters of Credit	Note 10. Debts and Letters of Credit
	As of March 28, 2015 and June 28, 2014, the Company’s Long-term debt on the Consolidated Balance Sheets represented the carrying amount of the liability component of the 0.625% Senior Convertible Notes as discussed below. The following table presents the details of the Company’s debt (in millions):
		March 28, 2015			June 28, 2014
	Principal amount of 0.625% Senior Convertible Notes	$	650		$	650
	Unamortized discount of liability component	(94.8		)	(113.7		)
	Carrying amount of liability component	$	555.2		$	536.3
	Carrying amount of equity component (1)	$	134.4		$	134.4
	(1) Included in Additional paid-in-capital on the Consolidated Balance Sheets.
	The Company was in compliance with all debt covenants as of March 28, 2015 and June 28, 2014, respectively.
	0.625% Senior Convertible Notes
	On August 21, 2013, the Company issued $650.0 million aggregate principal amount of 0.625% Senior Convertible Notes due 2033 (the “2033 Notes”) in a private offering to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended. The proceeds from the 2033 Notes amounted to $636.3 million after issuance costs. The 2033 Notes are an unsecured obligation of the Company and bear interest at an annual rate of 0.625% payable in cash semi-annually in arrears on February 15 and August 15 of each year. The 2033 Notes mature on August 15, 2033 unless earlier converted, redeemed or repurchased. The 2033 Notes and its terms are described in “Note 10. Debts and Letters of Credit” of the Company’s Annual Report on Form 10-K for the year ended June 28, 2014. During the nine months ended March 28, 2015, the price of the Company’s common stock did not exceed the initial conversion price of $18.83 per share and no conversion features were triggered.
	In accordance with the authoritative accounting guidance, the Company separated the 2033 Notes into liability and equity components. The carrying value of the liability component at issuance was calculated as the present value of its cash flows using a discount rate of 5.4% based on the 5-year swap rate plus credit spread as of the issuance date. The credit spread for the Company is based on the historical average “yield to worst” rate for BB rated issuers. The difference between the 2033 Notes principal and the carrying value of the liability component, representing the value of conversion premium assigned to the equity component, was recorded as a debt discount on the issuance date and is being accreted using the effective interest rate of 5.4% over the period from the issuance date through August 15, 2018 as a non-cash charge to interest expense. The carrying value of the liability component was determined to be $515.6 million, and the equity component, or debt discount, of the 2033 Notes was determined to be $134.4 million. As of March 28, 2015, the expected remaining term of the 2033 Notes is 3.4 years.
	In connection with the issuance of the 2033 Notes, the Company incurred $13.7 million of issuance costs, which were bifurcated into the debt issuance costs, attributable to the liability component of $10.9 million and the equity issuance costs, attributable to the equity component of $2.8 million based on their relative values. The debt issuance costs were capitalized and are being amortized to interest expense using the effective interest rate method from issuance date through August 15, 2018. The equity issuance costs were netted against the equity component in additional paid-in capital at the issuance date. As of March 28, 2015, the unamortized portion of the debt issuance costs related to the 2033 Notes was $7.7 million, which was included in Other non-current assets on the Consolidated Balance Sheets.
	Based on quoted market prices as of March 28, 2015 and June 28, 2014, the fair market value of the 2033 Notes was approximately $669.2 million and $653.0 million, respectively. The 2033 Notes are classified within Level 2 as they are not actively traded in markets.
	The following table presents the effective interest rate and the interest expense for the contractual interest and the accretion of debt discount (in millions, except for the effective interest rate):
		Three Months Ended						Nine Months Ended
		28-Mar-15			29-Mar-14			28-Mar-15			29-Mar-14
	Effective interest rate	5.4		%	5.4		%	5.4		%	5.4		%
	Interest expense-contractual interest	$	1.0		$	1.0		$	3.0		$	2.4
	Accretion of debt discount	6.3			6.0			18.8			14.6
	Revolving Credit Facility
	On August 21, 2013, in addition to the close of the 2033 Notes offering, the Company terminated its existing $250.0 million revolving credit facility, which had no amounts outstanding upon termination. The $1.3 million of unamortized debt issuance costs was fully amortized to interest expense upon termination in the first quarter of fiscal 2014.
	Outstanding Letters of Credit
	As of March 28, 2015, the Company had 11 standby letters of credit totaling $30.0 million.

Restructuring_and_Related_Char

Restructuring and Related Charges	9 Months Ended
	Mar. 28, 2015
Restructuring and Related Charges
Restructuring and Related Charges	Note 11. Restructuring and Related Charges
	The Company continues to engage in targeted restructuring events intended to consolidate its operations, rationalize the manufacturing of its products and align its businesses in response to market conditions. As of March 28, 2015 and June 28, 2014, the Company’s total restructuring accrual was $27.3 million and $26.2 million, respectively. During the three and nine months ended March 28, 2015, the Company recorded restructuring related expenses of $8.3 million and $20.9 million, respectively. During the three and nine months ended March 29, 2014, the Company recorded restructuring related expenses of $3.6 million and $3.8 million, respectively. The Company’s restructuring charges can include severance and benefit costs to eliminate a specified number of positions, facilities and equipment costs to vacate facilities and consolidate operations, and lease termination costs. The timing of associated cash payments is dependent upon the type of restructuring charge and can extend over multiple periods.
	Summary of Restructuring Plans
	The adjustments to the accrued restructuring expenses related to all of the Company’s restructuring plans described below for the three and nine months ended March 28, 2015 were as follows (in millions):
		Balance as of		Nine Months			Cash			Non-cash			Balance as of		Three Months
		June 28, 2014		Ended March 28,			Settlements			Settlements			March 28,		Ended March
				2015 Charges						and Other			2015		28, 2015 Charges
										Adjustments
	Fiscal 2015 Plan
	Separation Restructuring Plan (Workforce Reduction)	$	—	$	16.4		$	(4.0	)	$	(0.2	)	$	12.2	$	7.4
	CCOP Robbinsville Closure Plan:
	Workforce Reduction	—		1.5			(1.1		)	—			0.4		—
	Lease Costs	—		0.1			—			—			0.1		0.1
	Total CCOP Robbinsville Restructuring Plan	—		1.6			(1.1		)	—			0.5		0.1
	Fiscal 2014 Plans
	NE Realignment Plan (Workforce Reduction)	4.6		0.3			(4.0		)	(0.1		)	0.8		0.3
	CCOP Serangoon Closure Plan
	Workforce Reduction	1.7		0.1			(1.6		)	—			0.2		—
	Lease Costs	—		0.3			(0.2		)	—			0.1		0.3
	Total CCOP Serangoon Closure Plan	1.7		0.4			(1.8		)	—			0.3		0.3
	Shared Services Restructuring Plan (Workforce Reduction)	1.8		0.1			(0.9		)	—			1		—
	NE Product Strategy Restructuring Plan (Workforce Reduction)	4.4		0.4			(1.6		)	(0.7		)	2.5		—
	NE Lease Restructuring Plan (first floor)	6.9		0.5			(1.8		)	—			5.6		0.1
	Central Finance and IT Restructuring Plan (Workforce Reduction)	1.5		—			(0.1		)	(0.3		)	1.1		—
	Fiscal 2013 Plans
	NE Lease Restructuring Plan	2.1		(0.1		)	(0.4		)	—			1.6		—
	Other plans	0.7		0.7			(1.0		)	—			0.4		0.1
	Plans Prior to Fiscal 2013	2.5		0.6			(1.5		)	(0.3		)	1.3		—
	Total	$	26.2	$	20.9		$	(18.2	)	$	(1.6	)	$	27.3	$	8.3
	Ottawa Lease Exit Costs	$	3.1	$	(0.9	)	$	(0.8	)	$	(0.3	)	$	1.1	$	(0.9	)
	As of March 28, 2015 and June 28, 2014, $8.5 million and $11.7 million, respectively, of our restructuring liability was long-term in nature and included as a component of Other non-current liabilities, with the remaining short-term portion included as a component of Other current liabilities on the Consolidated Balance Sheets.
	The Company had also previously recorded lease exit charges, net of assumed sub-lease income in prior fiscal years related to its Ottawa facility that was included in SG&A expenses. The fair value of the remaining contractual obligations, net of sublease income, was $1.1 million and $3.1 million as of March 28, 2015 and June 28, 2014, respectively. The Company included the long-term portion of the contract obligations of $0.6 million and $2.0 million in Other non-current liabilities as of each period end, and the short-term portion in Other current liabilities in the Consolidated Balance Sheets. The payments related to these lease costs are expected to be paid by the end of the third quarter of fiscal 2018.
	Fiscal 2015 Plans
	Separation Restructuring Plan
	During the second quarter of fiscal 2015, Management approved a plan to eliminate certain positions in its shared services functions in connection with the Company’s plan to split into two separate public companies. Further, certain sales, R&D and operations positions will be eliminated in the CCOP, NE and SE segments to align to the Company’s product market strategy and lower manufacturing costs as the Company moves forward with its separation plan. In addition, during the third quarter of fiscal 2015, Management approved additional headcount adding to the plan approximately 80 employees primarily in the NE and SE segments. As a result, a restructuring charge of $7.4 million was recorded for severance and employee benefits during the third quarter of fiscal 2015. In total approximately 220 employees primarily in manufacturing, R&D, and SG&A functions located in North America, Latin America, Europe and Asia were impacted. Payments related to the remaining severance and benefits accrual are expected to be paid by the end of the third quarter of fiscal 2016.
	CCOP Robbinsville Closure Plan
	During the first quarter of fiscal 2015, Management approved a CCOP plan to optimize operations and gain efficiencies by closing the Robbinsville, New Jersey site and consolidating roles and responsibilities across North America. As a result, approximately 30 employees primarily in manufacturing, R&D and SG&A functions located in North America were impacted. Payments related to the remaining severance and benefits accrual are expected to be paid by the end of the fourth quarter of fiscal 2015.
	Fiscal 2014 Plans
	NE Realignment Plan
	During the fourth quarter of fiscal 2014, Management approved a NE plan to realign its operations and strategy to allow for greater investment in high-growth areas. As a result, approximately 100 employees primarily in manufacturing, R&D and SG&A functions located in United States, Asia and Europe were impacted. Payments related to the remaining severance and benefits accrual are expected to be paid by the end of the second quarter of fiscal 2016.
	CCOP Serangoon Closure Plan
	During the fourth quarter of fiscal 2014, Management approved a CCOP plan to close the Serangoon office located in Singapore and move to a lower cost region in order to reduce manufacturing and R&D expenses. As a result, approximately 40 employees primarily in manufacturing and R&D functions were impacted. Payments related to the remaining severance and benefits accrual are expected to be paid by the end of the fourth quarter of fiscal 2015.
	Shared Services Restructuring Plan
	During the fourth quarter of fiscal 2014, Management approved a plan to eliminate positions and re-define roles and responsibilities in its shared services functions in order to reduce cost, standardize global processes and establish a more efficient organization. As a result, approximately 40 employees primarily in the general and administrative functions located in the United States, Asia and Europe were impacted. Payments related to the remaining severance and benefits accrual are expected to be paid by the end of the second quarter of fiscal 2016.
	NE Product Strategy Restructuring Plan
	During the third quarter of fiscal 2014, Management approved a NE plan to realign its services, support and product resources in response to market conditions in the mobile assurance market and to increase focus on software products and next generation solutions through acquisitions and R&D. As a result, approximately 60 employees primarily in SG&A and manufacturing functions located in North America, Latin America, Asia and Europe were impacted. Payments related to the remaining severance and benefits accrual are expected to be paid by the end of the first quarter of fiscal 2020.
	NE Lease Restructuring Plan (first floor)
	During the second quarter of fiscal 2014, Management approved a NE plan to exit the remaining space in Germantown, Maryland. As of June 28, 2014, the Company exited the space in Germantown under the plan. The fair value of the remaining
	contractual obligations, net of sublease income, as of March 28, 2015 was $5.6 million. Payments related to the Germantown lease costs are expected to be paid by the end of the second quarter of fiscal 2019.
	Central Finance and Information Technology (“IT”) Restructuring Plan
	During the second quarter of fiscal 2014, Management approved a plan to eliminate positions and re-define roles and responsibilities in the Finance and IT organization to align with the future state of the organizations under new executive management and move positions to lower-cost locations where appropriate. As a result, approximately 20 employees primarily in SG&A functions located in North America, Asia and Europe were impacted. Payments related to the remaining severance and benefits accrual are expected to be paid by the end of the third quarter of fiscal 2022.
	Fiscal 2013 Plans
	NE Lease Restructuring Plan
	During the fourth quarter of fiscal 2013, Management approved a plan to consolidate space in Germantown, Maryland and Beijing, China, primarily used by the NE segment. As of June 29, 2013, the Company exited the second floor space in Germantown and Beijing under the plan. The fair value of the remaining contractual obligations, net of sublease income as of March 28, 2015 was $1.6 million. Payments related to the Germantown lease costs are expected to be paid by the end of the second quarter of fiscal 2019. Final payments related to the Beijing lease costs were paid during the first quarter of fiscal 2014.
	Other Plans
	Other plans account for an immaterial portion of the total restructuring accrual, with minimal or no revisions recorded.
	Plans Prior to Fiscal 2013
	The restructuring accrual for plans that commenced prior to fiscal year 2013 was $1.3 million, which consists of immaterial various restructuring plans that commenced prior to fiscal 2013.

Income_Taxes

Income Taxes	9 Months Ended
	Mar. 28, 2015
Income Taxes
Income Taxes	Note 12. Income Taxes
	The Company recorded an income tax benefit of $17.4 million and $2.5 million for the three and nine months ended March 28, 2015, respectively. The Company recorded an income tax benefit of $17.2 million and $13.7 million for the three and nine months ended March 29, 2014, respectively.
	The income tax benefit recorded for the three and nine months ended March 28, 2015, primarily relates to income tax in certain foreign and state jurisdictions based on the Company’s forecasted pre-tax income for the year in those locations, offset by a $21.8 million tax benefit recognized upon the settlement of an audit in a non-U.S. jurisdiction.
	The income tax benefit recorded for the three and nine months ended March 29, 2014, primarily relates to income tax in certain foreign and state jurisdictions based on the Company’s forecasted pre-tax income for the year in those locations offset by the recognition of $21.7 million of uncertain tax benefits related to deferred tax assets due to the expiration of the statute of limitations in a non-US jurisdiction. A tax benefit of $5.1 million was recorded for the nine months ended March 29, 2014, related to the income tax intraperiod tax allocation rules in relation to other comprehensive income.
	The income tax benefit and expense recorded differs from the expected tax expense or benefit that would be calculated by applying the federal statutory rate to the Company’s income or loss before income taxes primarily due to the increases in valuation allowance for deferred tax assets attributable to the Company’s domestic and foreign losses from continuing operations, due to the income tax benefit recorded in continuing operations under the income tax intraperiod tax allocation rules, and the recognition of the unrecognized tax benefits.
	As of March 28, 2015 and June 28, 2014, the Company’s unrecognized tax benefits totaled $38.3 million and $60.3 million, respectively, and are included in deferred taxes and other non-current tax liabilities, net. The Company had $1.6 million accrued for the payment of interest and penalties at March 28, 2015. The unrecognized tax benefits that may be recognized during the next twelve months are approximately $0.3 million.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Mar. 28, 2015
Stock-Based Compensation
Stock-Based Compensation	Note 13. Stock-Based Compensation
	Overview
	The impact on the Company’s results of operations of recording stock-based compensation by function for three and nine months ended March 28, 2015 and March 29, 2014 was as follows (in millions):
		Three Months Ended					Nine Months Ended
		March 28, 2015			March 29, 2014		March 28, 2015		March 29, 2014
	Cost of sales	$	2.3		$	2.7	$	7.0	$	7.7
	Research and development	3.9			4.1		11.5		11.7
	Selling, general and administrative	13.4			10.1		31.8		28.9
		$	19.6		$	16.9	$	50.3	$	48.3
	Approximately $1.9 million of stock-based compensation was capitalized in inventory at March 28, 2015.
	Full Value Awards
	“Full Value Awards” refer to RSUs and Performance Units that are granted with the exercise price equal to zero and are converted to shares immediately upon vesting. These Full Value Awards are performance-based, time-based or a combination of both and expected to vest over one year to four years. The fair value of the time-based Full Value Awards is based on the closing market price of the Company’s common stock on the date of award.
	During the nine months ended March 28, 2015 and March 29, 2014, the Company granted 5.6 million and 5.5 million RSUs, of which 0.7 million and 0.6 million, respectively, are RSUs with market conditions (“MSUs”). These MSU shares represent the target amount of grants, and the actual number of shares awarded upon vesting of the MSUs may be higher or lower depending upon the achievement of the relevant market conditions. The majority of MSUs vest in equal annual installments over three years based on the attainment of certain total shareholder return performance measures and the employee’s continued service through the vest date. The aggregate grant-date fair value of MSUs granted through the third quarter of fiscal 2015 and fiscal 2014 was estimated to be $9.4 million and $9.2 million, respectively, and was calculated using a Monte Carlo simulation. The remaining 4.9 million granted during the nine months ended March 28, 2015 and March 29, 2014 each are mainly time-based RSUs. The majority of these time-based RSUs vest over three years, with 33% vesting after one year and the balance vesting quarterly over the remaining two years.
	As of March 28, 2015, $83.9 million of unrecognized stock-based compensation cost related to Full Value Awards remains to be amortized. That cost is expected to be recognized over an estimated amortization period of 2.1 years.
	Full Value Awards are converted into shares upon vesting. Shares equivalent in value to the minimum withholding taxes liability on the vested shares are withheld by the Company for the payment of such taxes. During the nine months ended March 28, 2015 and March 29, 2014, the Company paid $17.2 million and $18.3 million, respectively, and classified the payments as operating cash outflows in the Consolidated Statements of Cash Flows.
	Impact on Stock-based Compensation Due to Amendments in the Change of Control Benefits Plan
	During the nine months ended March 28, 2015, the Company amended its Change of Control Benefits Plan (the “Plan”) to add a spin-off of certain Company assets to the circumstances that could trigger benefits under the Plan, as well as other revisions. During the current fiscal period, the Chief Executive Officer of the Company and the Chairman of the Compensation Committee approved the separation of certain executives. Pursuant to the Plan, upon termination, all unvested equity awards that have been granted or issued to certain terminated executives become immediately vested and stock options shall become fully exercisable with an extended exercise period of two years from the termination date.
	The amendments resulted in a modification of equity awards for certain executives and total incremental stock-based compensation of $6.3 million, which is being amortized over the period between the modification date and the termination dates of the executives. The Company recognized $3.2 million and $4.9 million of stock-based compensation resulting from the modification during the three months ended and the nine months ended March 28, 2015, respectively.
	Valuation Assumptions
	The Company estimates the fair value of the MSUs on the date of grant using a Monte Carlo simulation with the following assumptions:
		Nine Months Ended
		March 28, 2015		March 29, 2014
	Volatility of common stock	40.8	%	53.9	%
	Average volatility of peer companies	53.4	%	58.6	%
	Average correlation coefficient of peer companies	0.2156		0.2920
	Risk-free interest rate	0.6	%	0.8	%

Employee_Defined_Benefit_Plans

Employee Defined Benefit Plans	9 Months Ended
	Mar. 28, 2015
Employee Defined Benefit Plans
Employee Defined Benefit Plans	Note 14. Employee Defined Benefit Plans
	The Company sponsors significant qualified and non-qualified pension plans for certain past and present employees primarily in the United Kingdom (“U.K.”), Germany and Switzerland. The Company also is responsible for the non-pension post-retirement benefit obligation assumed from a past acquisition. Most of the plans have been closed to new participants and no additional service costs are being accrued, except for certain plans in Germany and Switzerland assumed in connection with acquisitions during fiscal 2010 and fiscal 2014. Benefits are generally based upon years of service and compensation or stated amounts for each year of service.
	As of March 28, 2015, the U.K. plan and Switzerland plan were partially funded while the other plans were unfunded. The Company’s policy for funded plans is to make contributions equal to or greater than the requirements prescribed by law or regulation. For unfunded plans, the Company pays the post-retirement benefits when due. During the nine months ended March 28, 2015, the Company contributed $1.1 million to the U.K. and $0.4 million to the Switzerland plans. The funded plan assets consist primarily of managed investments.
	The following table presents the components of the net periodic cost for the pension plans (in millions):
		Three Months Ended						Nine Months Ended
	Pension Benefits	March 28, 2015			March 29, 2014			March 28, 2015			March 29, 2014
	Service cost	$	0.1		$	0.2		$	0.4		$	0.4
	Interest cost	0.9			1.2			2.9			3.6
	Expected return on plan assets	(0.5		)	(0.4		)	(1.3		)	(1.2		)
	Recognized net actuarial (gains)/losses	0.1			—			0.4			0.1
	Net periodic benefit cost	$	0.6		$	1		$	2.4		$	2.9
	Both the calculation of the projected benefit obligation and net periodic cost are based upon actuarial valuations. These valuations use participant-specific information such as salary, age, years of service, and assumptions about interest rates, pension increases and other factors. At a minimum, the Company evaluates these assumptions annually and makes changes as necessary.
	The Company expects to incur cash outlays of approximately $4.4 million related to its defined benefit pension plans during fiscal 2015 to make current benefit payments and fund future obligations. As of March 28, 2015, approximately $4.7 million had been incurred. These payments have been estimated based on the same assumptions used to measure the Company’s projected benefit obligation at June 28, 2014.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Mar. 28, 2015
Commitments and Contingencies
Commitments and Contingencies	Note 15. Commitments and Contingencies
	Legal Proceedings
	The Company is subject to a variety of claims and suits that arise from time to time in the ordinary course of our business. While Management currently believes that resolving claims against the Company, individually or in aggregate, will not have a material adverse impact on its financial position, results of operations or statement of cash flows, these matters are subject to inherent uncertainties and Management’s view of these matters may change in the future. If an unfavorable final outcome occurs, it is possible there could be a material adverse impact on the Company’s financial position, results of operations or cash flows for the period in which the effect becomes reasonably estimable.
	Guarantees
	In accordance with authoritative guidance which requires that upon issuance of a guarantee, the guarantor must recognize a liability for the fair value of the obligation it assumes under that guarantee. In addition, disclosures about the guarantees that an entity has issued, including a tabular reconciliation of the changes of the entity’s product warranty liabilities, are required.
	The Company from time to time enters into certain types of contracts that contingently require the Company to indemnify parties against third-party claims. These contracts primarily relate to: (i) divestiture agreements, under which the Company may provide customary indemnifications to purchasers of the Company’s businesses or assets; (ii) certain real estate leases, under which the Company may be required to indemnify property owners for environmental and other liabilities, and other claims arising from the Company’s use of the applicable premises; and (iii) certain agreements with the Company’s officers, directors and employees, under which the Company may be required to indemnify such persons for liabilities arising out of their employment relationship.
	The terms of such obligations vary. Generally, a maximum obligation is not explicitly stated. Because the obligated amounts of these types of agreements often are not explicitly stated, the overall maximum amount of the obligations cannot be reasonably estimated. Historically, the Company has not been obligated to make significant payments for these obligations, and no liabilities have been recorded for these obligations on its balance sheet as of March 28, 2015 and June 28, 2014.
	Product Warranties
	In general, the Company offers a three-month to one-year warranty for most of its products. The Company provides reserves for the estimated costs of product warranties at the time revenue is recognized. The Company estimates the costs of its warranty obligations based on its historical experience of known product failure rates, use of materials to repair or replace defective products and service delivery costs incurred in correcting product failures. In addition, from time to time, specific warranty accruals may be made if unforeseen technical problems arise with specific products. The Company periodically assesses the adequacy of its recorded warranty liabilities and adjusts the amounts as necessary.
	The following table presents the changes in the Company’s warranty reserve (in millions):
		Three Months Ended						Nine Months Ended
		March 28, 2015			March 29, 2014			March 28, 2015			March 29, 2014
	Balance as of beginning of period	$	5.4		$	6.8		$	6.3		$	6.9
	Provision for warranty	1.6			1.7			4.5			6.3
	Utilization of reserve	(0.8		)	(1.2		)	(4.4		)	(4.3		)
	Adjustments related to pre-existing warranties (including changes in estimates)	(0.8		)	(0.4		)	(1.0		)	(2.0		)
	Balance as of end of period	$	5.4		$	6.9		$	5.4		$	6.9

Operating_Segments

Operating Segments	9 Months Ended
	Mar. 28, 2015
Operating Segments
Operating Segments	Note 16. Operating Segments
	The Company evaluates its reportable segments in accordance with the authoritative guidance on segment reporting. The Company’s Chief Executive Officer, Thomas H. Waechter, is the Company’s Chief Operating Decision Maker (“CODM”) pursuant to the guidance. The CODM allocates resources to the segments based on their business prospects, competitive factors, net revenue and operating results.
	The Company is a leading provider of network service and enablement solutions and optical products for telecommunications (“Telecom”) service providers, cable operators, network equipment manufacturers (“NEMs”) and enterprises. JDSU’s diverse technology portfolio also fights counterfeiting and enables commercial lasers for a range of manufacturing applications.
	In the first quarter of fiscal 2015, the Company reorganized its NSE reportable segment into two separate reportable segments, Network Enablement and Service Enablement. Splitting NSE into two reportable segments provides greater clarity and transparency regarding the markets, financial performance and business models of the NE and SE businesses. NE is a hardware-centric and more mature business consisting primarily of NSE’s traditional communications test instrument products. SE is a more software-centric business consisting primarily of software solutions that are embedded within the network and enterprise performance management solutions. Historical segment numbers have been recast to conform to this new reporting structure in our financial statements.
	The Company’s reportable segments are:
	(i) Network Enablement:
	NE provides testing solutions that access the network to perform build out and maintenance tasks. These solutions include instruments and software to design, build, turn-up, certify, troubleshoot, and optimize networks.
	(ii) Service Enablement:
	SE solutions are embedded systems that yield network, service and application performance data. These solutions—including microprobes and software—monitor, collect and analyze network data to reveal the actual customer experience and to identify opportunities for new revenue streams and network optimization.
	(iii) Communications and Commercial Optical Products:
	CCOP provides optical components, modules, subsystems, and solutions used by Telecom and data communications (“Datacom”) network equipment manufacturers (“NEMs”) and both traditional and cloud/data center service providers. These products enable the transmission and transport of video, audio and text data over high-capacity fiber optic cables. Transmission products primarily consist of optical transceivers, optical transponders, and their supporting components such as modulators and source lasers, including innovative products such as the Tunable Small Form-factor Pluggable Plus transceiver. Transport products primarily consist of modules or sub-systems containing optical amplifiers, reconfigurable optical add/drop multiplexers (“ROADMs”) or Wavelength Selective Switches, Optical Channel Monitors and their supporting components. Our products for 3D sensing applications, formerly referred to as our gesture recognition products, include a light source product. Customer solutions containing our 3D sensing products let a person control electronic or computer devices with natural body or hand gestures instead of using a remote, mouse or other device.
	CCOP also provides a broad laser portfolio that serve customers in markets and applications such as manufacturing, biotechnology, graphics and imaging, remote sensing, and precision machining such as drilling in printed circuit boards, wafer singulation and solar cell scribing. These products include diode, direct-diode, diode-pumped solid-state, fiber, and gas lasers. In addition, our photonic power products include fiber optic-based systems for delivering and measuring electrical power.
	(iv) Optical Security and Performance Products:
	OSP provides innovative optical security solutions, with a strategic focus on serving the anti-counterfeiting market through advanced security pigments, thread substrates and printed features for the currency, pharmaceutical and consumer electronic segments. OSP also provides thin-film coating solutions for 3D and gesture recognition applications.
	The accounting policies of the reportable segments are the same as those described in the Company’s Annual Report on Form 10-K for the year ended June 28, 2014. The Company evaluates segment performance based on operating income (loss), excluding certain infrequent or unusual items.
	The amounts shown as Corporate consist of certain unallocated corporate-level operating expenses. In addition, the Company does not allocate stock-based compensation, acquisition-related charges and amortization of intangibles, restructuring and related charges, non-operating income and expenses, or other non-recurring charges to its segments as highlighted in the table below.
	Information on reportable segments is as follows (in millions):
		Three Months Ended						Nine Months Ended
		March 28,			March 29,			March 28,			March 29,
		2015			2014			2015			2014
	Net revenue:
	Network Enablement	$	128.1		$	136		$	394.6		$	436.9
	Service Enablement	39			36.3			132.9			102.3
	Communications and Commercial Optical Products	195.2			194.6			611.6			597.2
	Optical Security and Performance Products	48.4			51.1			142.3			158.2
	Net revenue	$	410.7		$	418		$	1,281.40		$	1,294.60
	Operating income (loss):
	Network Enablement	$	25.8		$	18.7		$	68.4		$	72.1
	Service Enablement	(9.5		)	(8.8		)	(11.2		)	(20.9		)
	Communications and Commercial Optical Products	17.4			22.4			69.1			73.5
	Optical Security and Performance Products	19.1			18.2			53.8			57.8
	Corporate	(21.5		)	(23.3		)	(66.2		)	(70.7		)
	Total segment operating income	31.3			27.2			113.9			111.8
	Unallocated amounts:
	Stock-based compensation	(19.6		)	(16.9		)	(50.3		)	(48.3		)
	Amortization of intangibles	(15.8		)	(16.2		)	(47.0		)	(43.0		)
	Loss on disposal of long-lived assets	(0.5		)	(1.0		)	(0.5		)	(0.8		)
	Restructuring and related charges (1)	(8.3		)	(3.6		)	(20.9		)	(3.8		)
	Other charges related to non-recurring activities (1)	(9.4		)	(1.1		)	(21.5		)	(1.1		)
	Interest and other income (expense), net	0.3			0.6			1.2			0.4
	Interest expense	(8.6		)	(7.7		)	(25.4		)	(21.3		)
	(Loss) income from operations before income taxes	$	(30.6	)	$	(18.7	)	$	(50.5	)	$	(6.1	)
	(1) During the three and nine months ended March 28, 2015, the Company incurred incremental expenses of $16.2 million and $32.9 million, respectively, to effect the Company’s plan to separate into two separate public companies. These incremental expenses included (a) restructuring charges, (b) accounting, legal, and other professional fees, (c) and cost of additional personnel and related costs dedicated to affect the separation and/or to enable Lumentum to operate successfully immediately following the split.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	9 Months Ended
	Mar. 28, 2015
Basis of Presentation
Fiscal Years	Fiscal Years
	The Company utilizes a 52-53 week fiscal year ending on the Saturday closest to June 30th. The Company’s fiscal 2015 is a 52-week year ending on June 27, 2015. The Company’s fiscal 2014 was a 52-week year ending on June 28, 2014.
Change in Reportable Segments	Change in Reportable Segments
	During the first quarter of fiscal 2015 the Company reorganized its Network Service and Enablement (“NSE”) reportable segment into two separate reportable segments: Network Enablement (“NE”) and Service Enablement (“SE”). This change does not impact previously reported consolidated financial information. However, historical information related to the NSE reportable segment has been recast to reflect the new NE and SE reportable segment structure. Refer to “Note 16. Operating Segments” for more information.
JDSU Separation	JDSU Separation
	On September 10, 2014, the Company announced plans to separate into two publicly traded companies: an optical components and commercial lasers company consisting of JDSU’s current Communications and Commercial Optical Products (“CCOP”) segment, and a network and service enablement company consisting of JDSU’s current Network Enablement (“NE”), Service Enablement (“SE”) and Optical Security and Performance Products (“OSP”) segments. On February 26, 2015, the Company announced that the optical components and commercial lasers company will be named Lumentum Holdings Inc. (“Lumentum”), and the network and service enablement company will be renamed Viavi Solutions Inc. (“Viavi”) at the time of the separation. The separation is expected to occur through a tax-free pro rata spinoff of Lumentum to JDSU shareholders, though the structure is subject to change based upon various business, tax and regulatory factors. The Company expects to complete the separation by the calendar third quarter of 2015.
Principles of Consolidation	Principles of Consolidation
	The consolidated financial statements have been prepared in accordance with U.S. GAAP and include the Company and its wholly-owned subsidiaries. All inter-company accounts and transactions have been eliminated.
Use of Estimates	Use of Estimates
	The preparation of the Company’s consolidated financial statements in conformity with U.S. GAAP requires Management to make estimates and assumptions that affect the reported amount of assets and liabilities at the date of the financial statements, the reported amount of net revenue and expenses and the disclosure of commitments and contingencies during the reporting periods. The Company bases estimates on historical experience and on various assumptions about the future believed to be reasonable based on available information. The Company’s reported financial position or results of operations may be materially different under changed conditions or when using different estimates and assumptions, particularly with respect to significant accounting policies. If estimates or assumptions differ from actual results, subsequent periods are adjusted to reflect more current information.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Mar. 28, 2015
Earnings Per Share
Schedule of computation of basic and diluted net (loss) income per share
	The following table sets forth the computation of basic and diluted net (loss) income per share (in millions, except per share data):
		Three Months Ended						Nine Months Ended
		March 28, 2015			March 29, 2014			March 28, 2015			March 29, 2014
	Numerator:
	Net (loss) income	$	(13.2	)	$	(1.5	)	$	(48.0	)	$	7.6
	Denominator:
	Weighted-average number of common shares outstanding:
	Basic	233.2			234			232.1			234.1
	Effect of dilutive securities from stock-based benefit plans	—			—			—			3.6
	Diluted	233.2			234			232.1			237.7
	Net (loss) income per share from:
	Basic	$	(0.06	)	$	(0.01	)	$	(0.21	)	$	0.03
	Diluted	$	(0.06	)	$	(0.01	)	$	(0.21	)	$	0.03
Schedule of weighted average potentially dilutive securities excluded from the computation because their effect would have been anti-dilutive	The following table sets forth the weighted-average potentially dilutive securities excluded from the computation of the diluted net (loss) income per share because their effect would have been anti-dilutive (in millions):
		Three Months Ended				Nine Months Ended
		March 28, 2015		March 29, 2014		March 28, 2015		March 29, 2014
		(1)(2)		(1)(2)		(1)(2)		-2
	Employee stock options and ESPP	3.7		4.6		3.8		1.1
	RSUs	10.4		10.2		10.6		2.9
	Total potentially dilutive securities	14.1		14.8		14.4		4.0
	(1) As the Company incurred a net loss in the period, potential dilutive securities from employee stock options, employee stock purchase plan (“ESPP”) and Restricted Stock Units (“RSUs”) have been excluded from the diluted net loss per share computations as their effects were deemed anti-dilutive.
	(2) The Company’s 0.625% Senior Convertible Notes due 2033 (the “2033 Notes”) are not included in the table above. The par amount of convertible notes is payable in cash equal to the principal amount of the notes plus any accrued and unpaid interest and then the “in-the-money” conversion benefit feature at the conversion price above $18.83 per share is payable in cash, shares of the Company’s common stock or a combination of both. Refer to “Note 10. Debts and Letters of Credit” for more details.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive (Loss) Income (Tables)	9 Months Ended
	Mar. 28, 2015
Accumulated Other Comprehensive (Loss) Income
Schedule of components of accumulated other comprehensive (loss) income	For the nine months ended March 28, 2015, the changes in accumulated other comprehensive (loss) income by component net of tax were as follows (in millions):
		Unrealized			Foreign currency			Defined benefit			Total
		losses on			translation			obligation, net
		available-for-			adjustments			of tax (1)
		sale investments
	Beginning balance as of June 28, 2014	$	(2.8	)	$	26.2		$	(12.3	)	$	11.1
	Other comprehensive (loss) income before reclassification adjustments	(0.4		)	(63.0		)	—			(63.4		)
	Amounts reclassified from accumulated other comprehensive (loss) income	—			—			0.4			0.4
	Net current-period other comprehensive (loss) income	(0.4		)	(63.0		)	0.4			(63.0		)
	Ending balance as of March 28, 2015	$	(3.2	)	$	(36.8	)	$	(11.9	)	$	(51.9	)
	(1) Amount represents the amortization of actuarial losses included as a component of Selling, general and administrative expense (“SG&A”) in the Consolidated Statements of Operations for the nine months ended March 28, 2015. There was no tax impact. Refer to “Note 14. Employee Defined Benefit Plans” for more details on the computation of net periodic cost for pension plans.

Balance_Sheet_and_Other_Detail1

Balance Sheet and Other Details (Tables)	9 Months Ended
	Mar. 28, 2015
Balance Sheet and Other Details
Activities and balances for allowance for doubtful accounts
	The activities and balances for allowance for doubtful accounts and allowance for sales returns were as follows (in millions):
		June 28, 2014		Charged to Costs		Adjustments (1)			March 28, 2015
				and Expenses
	Allowance for doubtful accounts	$	3	$	0.7	$	(0.7	)	$	3
	Allowance for sales returns	0.5		1.2		(1.0		)	0.7
	Total accounts receivable reserves	$	3.5	$	1.9	$	(1.7	)	$	3.7
	(1) Represents the effect of currency translation adjustments and write-offs of uncollectible accounts, net of recoveries.
Schedule of components of Inventories, net	Inventories, net are stated at the lower of cost or market, and include material, labor and manufacturing overhead costs. The components of Inventories, net were as follows (in millions):
		March 28, 2015		June 28, 2014
	Finished goods	$	87.5	$	78.4
	Work in process	31.5		40.1
	Raw materials	36.8		34.8
	Inventories, net	$	155.8	$	153.3
Schedule of components of Prepayments and other current assets	The components of Prepayments and other current assets were as follows (in millions):
		March 28, 2015		June 28, 2014
	Prepayments	$	34.2	$	33.3
	Other current assets	46.1		45.4
	Prepayments and other current assets	$	80.3	$	78.7
Schedule of components of Other current liabilities	The components of Other current liabilities were as follows (in millions):
		March 28, 2015		June 28, 2014
	Deferred compensation plan	$	3.4	$	3.9
	Warranty	4.0		5.3
	Restructuring	18.8		14.5
	Holdback liabilities from acquisitions	2.3		22.5
	Other	13.3		11.5
	Other current liabilities	$	41.8	$	57.7
Schedule of components of Other non-current liabilities	The components of Other non-current liabilities were as follows (in millions):
		March 28, 2015		June 28, 2014
	Pension and post-employment benefits	$	84.8	$	107.3
	Financing obligation	29.3		31.4
	Long-term deferred revenue	27.4		22.7
	Other	39.9		58.1
	Other non-current liabilities	$	181.4	$	219.5

Investments_and_Fair_Value_Mea1

Investments and Fair Value Measurements (Tables)	9 Months Ended
	Mar. 28, 2015
Investments and Fair Value Measurements
Schedule of available-for-sale securities
	As of March 28, 2015, the Company’s available-for-sale securities were as follows (in millions):
		Amortized		Gross Unrealized		Gross Unrealized			Estimated
		Cost/Carrying		Gains		Losses			Fair Value
		Cost
	Debt securities:
	U.S. treasuries	$	34.9	$	—	$	—		$	34.9
	U.S. agencies	96.3		—		—			96.3
	Municipal bonds and sovereign debt instruments	11.6		—		—			11.6
	Asset-backed securities	75.3		—		(0.2		)	75.1
	Corporate securities	348.4		0.1		(0.1		)	348.4
	Total debt available-for-sale securities	$	566.5	$	0.1	$	(0.3	)	$	566.3
	As of June 28, 2014, the Company’s available-for-sale securities were as follows (in millions):
		Amortized		Gross Unrealized		Gross Unrealized			Estimated
		Cost/Carrying		Gains		Losses			Fair Value
		Cost
	Debt securities:
	U.S. treasuries	$	36.8	$	—	$	—		$	36.8
	U.S. agencies	70		—		—			70
	Municipal bonds and sovereign debt instruments	16.8		—		—			16.8
	Asset-backed securities	94.7		0.1		(0.2		)	94.6
	Corporate securities	370.5		0.2		—			370.7
	Total debt available-for-sale securities	$	588.8	$	0.3	$	(0.2	)	$	588.9
Schedule of contractual maturities of available-for-sale securities	As of March 28, 2015, contractual maturities of the Company’s debt securities classified as available-for-sale securities were as follows (in millions):
		Amortized		Estimated
		Cost/Carrying Cost		Fair Value
	Amounts maturing in less than 1 year	$	413.8	$	413.7
	Amounts maturing in 1 - 5 years	151.7		151.8
	Amounts maturing in more than 5 years	1.0		0.8
	Total debt available-for-sale securities	$	566.5	$	566.3
Schedule of assets measured at fair value	Assets measured at fair value as of March 28, 2015 are summarized below (in millions):
		Fair Value measurement as of
		March 28, 2015
		Total		Quoted Prices in Active		Significant Other
				Markets for Identical		Observable Inputs
				Assets (Level 1)		(Level 2)
	Assets:
	Debt available-for-sale securities:
	U.S. treasuries	$	34.9	$	34.9	$	—
	U.S. agencies	96.3		—		96.3
	Municipal bonds and sovereign debt instruments	11.6		—		11.6
	Asset-backed securities	75.1		—		75.1
	Corporate securities	348.4		—		348.4
	Total debt available-for-sale securities	566.3		34.9		531.4
	Money market funds	163.0		163.0		—
	Trading securities	3.4		3.4		—
	Total assets (1)	$	732.7	$	201.3	$	531.4
	(1) $212.2 million in cash and cash equivalents, $489.7 million in short-term investments, $26.2 million in restricted cash, and $4.6 million in other non-current assets on the Company’s Consolidated Balance Sheets.

Goodwill_Tables

Goodwill (Tables)	9 Months Ended
	Mar. 28, 2015
Goodwill
Schedule of changes in goodwill
	The following table presents the changes in goodwill allocated to the reportable segments (in millions):
		Network			Service			Communications			Optical Security		Total
		Enablement (1)			Enablement (1)			and Commercial			and Performance
								Optical Products (2)			Products
	Balance as of June 28, 2014	$	158		$	94.8		$	5.9		$	8.3	$	267
	Currency translation adjustments	(5.1		)	(3.0		)	(0.4		)	—		(8.5		)
	Balance as of March 28, 2015	$	152.9		$	91.8		$	5.5		$	8.3	$	258.5
	(1) In the first quarter of fiscal 2015, the Company reorganized its NSE reportable segment into two separate reportable segments, NE and SE. The goodwill of NSE was allocated between the two new segments based on their relative fair value as of June 29, 2014, the first day of fiscal 2015. The Company determined that based on its cash flow structure, organizational structure and the financial information provided to and reviewed by Management, NE and SE also represented new reporting units for fiscal 2015. Refer to “Note 16. Operating Segments” for more information.
	(2) The goodwill balance as of March 28, 2015 for the CCOP segment relates to the acquisition of Time-Bandwidth and has been allocated to the Lasers reporting unit.

Acquired_Developed_Technology_1

Acquired Developed Technology and Other Intangibles (Tables)	9 Months Ended
	Mar. 28, 2015
Acquired Developed Technology and Other Intangibles
Schedule of acquired developed technology, customer relationships and other intangibles
	The following tables present details of the Company’s acquired developed technology, customer relationships and other intangibles (in millions):
	As of March 28, 2015	Gross Carrying		Accumulated			Net
		Amount		Amortization
	Acquired developed technology	$	529	$	(456.3	)	$	72.7
	Customer relationships	192		(144.6		)	47.4
	Other	22.5		(21.2		)	1.3
	Total intangibles subject to amortization	743.5		(622.1		)	121.4
	In-process research and development intangibles	3.5		—			3.5
	Total intangibles	$	747	$	(622.1	)	$	124.9
	As of June 28, 2014	Gross Carrying		Accumulated			Net
		Amount		Amortization
	Acquired developed technology	$	548.8	$	(443.1	)	$	105.7
	Customer relationships	205.2		(142.3		)	62.9
	Other	24.2		(22.1		)	2.1
	Total intangibles subject to amortization	778.2		(607.5		)	170.7
	In-process research and development intangibles	7.1		—			7.1
	Total intangibles	$	785.3	$	(607.5	)	$	177.8
Schedule of estimated future amortization	Based on the carrying amount of acquired developed technology, customer relationships and other intangibles as of March 28, 2015, and assuming no future impairment of the underlying assets, the estimated future amortization is as follows (in millions):
	Fiscal Years
	Remainder of 2015	$	12.0
	2016	37.8
	2017	34.7
	2018	22.2
	2019	10.9
	Thereafter	3.8
	Total amortization	$	121.4

Debts_and_Letters_of_Credit_Ta

Debts and Letters of Credit (Tables)	9 Months Ended
	Mar. 28, 2015
Debts and Letters of Credit
Schedule of details of the Company's debt
	As of March 28, 2015 and June 28, 2014, the Company’s Long-term debt on the Consolidated Balance Sheets represented the carrying amount of the liability component of the 0.625% Senior Convertible Notes as discussed below. The following table presents the details of the Company’s debt (in millions):
		March 28, 2015			June 28, 2014
	Principal amount of 0.625% Senior Convertible Notes	$	650		$	650
	Unamortized discount of liability component	(94.8		)	(113.7		)
	Carrying amount of liability component	$	555.2		$	536.3
	Carrying amount of equity component (1)	$	134.4		$	134.4
	(1) Included in Additional paid-in-capital on the Consolidated Balance Sheets.
Summary of effective interest rate and interest expense for the contractual interest and the accretion of debt discount	The following table presents the effective interest rate and the interest expense for the contractual interest and the accretion of debt discount (in millions, except for the effective interest rate):
		Three Months Ended						Nine Months Ended
		28-Mar-15			29-Mar-14			28-Mar-15			29-Mar-14
	Effective interest rate	5.4		%	5.4		%	5.4		%	5.4		%
	Interest expense-contractual interest	$	1.0		$	1.0		$	3.0		$	2.4
	Accretion of debt discount	6.3			6.0			18.8			14.6

Restructuring_and_Related_Char1

Restructuring and Related Charges (Tables)	9 Months Ended
	Mar. 28, 2015
Restructuring and Related Charges
Schedule of various restructuring plans	The adjustments to the accrued restructuring expenses related to all of the Company’s restructuring plans described below for the three and nine months ended March 28, 2015 were as follows (in millions):
		Balance as of		Nine Months			Cash			Non-cash			Balance as of		Three Months
		June 28, 2014		Ended March 28,			Settlements			Settlements			March 28,		Ended March
				2015 Charges						and Other			2015		28, 2015 Charges
										Adjustments
	Fiscal 2015 Plan
	Separation Restructuring Plan (Workforce Reduction)	$	—	$	16.4		$	(4.0	)	$	(0.2	)	$	12.2	$	7.4
	CCOP Robbinsville Closure Plan:
	Workforce Reduction	—		1.5			(1.1		)	—			0.4		—
	Lease Costs	—		0.1			—			—			0.1		0.1
	Total CCOP Robbinsville Restructuring Plan	—		1.6			(1.1		)	—			0.5		0.1
	Fiscal 2014 Plans
	NE Realignment Plan (Workforce Reduction)	4.6		0.3			(4.0		)	(0.1		)	0.8		0.3
	CCOP Serangoon Closure Plan
	Workforce Reduction	1.7		0.1			(1.6		)	—			0.2		—
	Lease Costs	—		0.3			(0.2		)	—			0.1		0.3
	Total CCOP Serangoon Closure Plan	1.7		0.4			(1.8		)	—			0.3		0.3
	Shared Services Restructuring Plan (Workforce Reduction)	1.8		0.1			(0.9		)	—			1		—
	NE Product Strategy Restructuring Plan (Workforce Reduction)	4.4		0.4			(1.6		)	(0.7		)	2.5		—
	NE Lease Restructuring Plan (first floor)	6.9		0.5			(1.8		)	—			5.6		0.1
	Central Finance and IT Restructuring Plan (Workforce Reduction)	1.5		—			(0.1		)	(0.3		)	1.1		—
	Fiscal 2013 Plans
	NE Lease Restructuring Plan	2.1		(0.1		)	(0.4		)	—			1.6		—
	Other plans	0.7		0.7			(1.0		)	—			0.4		0.1
	Plans Prior to Fiscal 2013	2.5		0.6			(1.5		)	(0.3		)	1.3		—
	Total	$	26.2	$	20.9		$	(18.2	)	$	(1.6	)	$	27.3	$	8.3
	Ottawa Lease Exit Costs	$	3.1	$	(0.9	)	$	(0.8	)	$	(0.3	)	$	1.1	$	(0.9	)

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Mar. 28, 2015
Stock-Based Compensation
Schedule of the impact on the entity's results of operations of recording stock-based compensation by function	The impact on the Company’s results of operations of recording stock-based compensation by function for three and nine months ended March 28, 2015 and March 29, 2014 was as follows (in millions):
		Three Months Ended					Nine Months Ended
		March 28, 2015			March 29, 2014		March 28, 2015		March 29, 2014
	Cost of sales	$	2.3		$	2.7	$	7.0	$	7.7
	Research and development	3.9			4.1		11.5		11.7
	Selling, general and administrative	13.4			10.1		31.8		28.9
		$	19.6		$	16.9	$	50.3	$	48.3
Schedule of valuation assumptions for MSU using Monte Carlo simulation
		Nine Months Ended
		March 28, 2015		March 29, 2014
	Volatility of common stock	40.8	%	53.9	%
	Average volatility of peer companies	53.4	%	58.6	%
	Average correlation coefficient of peer companies	0.2156		0.2920
	Risk-free interest rate	0.6	%	0.8	%

Employee_Defined_Benefit_Plans1

Employee Defined Benefit Plans (Tables)	9 Months Ended
	Mar. 28, 2015
Employee Defined Benefit Plans
Schedule of net periodic cost for the pension plans	The following table presents the components of the net periodic cost for the pension plans (in millions):
		Three Months Ended						Nine Months Ended
	Pension Benefits	March 28, 2015			March 29, 2014			March 28, 2015			March 29, 2014
	Service cost	$	0.1		$	0.2		$	0.4		$	0.4
	Interest cost	0.9			1.2			2.9			3.6
	Expected return on plan assets	(0.5		)	(0.4		)	(1.3		)	(1.2		)
	Recognized net actuarial (gains)/losses	0.1			—			0.4			0.1
	Net periodic benefit cost	$	0.6		$	1		$	2.4		$	2.9

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Mar. 28, 2015
Commitments and Contingencies
Schedule of changes in the entity's warranty reserve	The following table presents the changes in the Company’s warranty reserve (in millions):
		Three Months Ended						Nine Months Ended
		March 28, 2015			March 29, 2014			March 28, 2015			March 29, 2014
	Balance as of beginning of period	$	5.4		$	6.8		$	6.3		$	6.9
	Provision for warranty	1.6			1.7			4.5			6.3
	Utilization of reserve	(0.8		)	(1.2		)	(4.4		)	(4.3		)
	Adjustments related to pre-existing warranties (including changes in estimates)	(0.8		)	(0.4		)	(1.0		)	(2.0		)
	Balance as of end of period	$	5.4		$	6.9		$	5.4		$	6.9

Operating_Segments_Tables

Operating Segments (Tables)	9 Months Ended
	Mar. 28, 2015
Operating Segments
Schedule of information on reportable segments	Information on reportable segments is as follows (in millions):
		Three Months Ended						Nine Months Ended
		March 28,			March 29,			March 28,			March 29,
		2015			2014			2015			2014
	Net revenue:
	Network Enablement	$	128.1		$	136		$	394.6		$	436.9
	Service Enablement	39			36.3			132.9			102.3
	Communications and Commercial Optical Products	195.2			194.6			611.6			597.2
	Optical Security and Performance Products	48.4			51.1			142.3			158.2
	Net revenue	$	410.7		$	418		$	1,281.40		$	1,294.60
	Operating income (loss):
	Network Enablement	$	25.8		$	18.7		$	68.4		$	72.1
	Service Enablement	(9.5		)	(8.8		)	(11.2		)	(20.9		)
	Communications and Commercial Optical Products	17.4			22.4			69.1			73.5
	Optical Security and Performance Products	19.1			18.2			53.8			57.8
	Corporate	(21.5		)	(23.3		)	(66.2		)	(70.7		)
	Total segment operating income	31.3			27.2			113.9			111.8
	Unallocated amounts:
	Stock-based compensation	(19.6		)	(16.9		)	(50.3		)	(48.3		)
	Amortization of intangibles	(15.8		)	(16.2		)	(47.0		)	(43.0		)
	Loss on disposal of long-lived assets	(0.5		)	(1.0		)	(0.5		)	(0.8		)
	Restructuring and related charges (1)	(8.3		)	(3.6		)	(20.9		)	(3.8		)
	Other charges related to non-recurring activities (1)	(9.4		)	(1.1		)	(21.5		)	(1.1		)
	Interest and other income (expense), net	0.3			0.6			1.2			0.4
	Interest expense	(8.6		)	(7.7		)	(25.4		)	(21.3		)
	(Loss) income from operations before income taxes	$	(30.6	)	$	(18.7	)	$	(50.5	)	$	(6.1	)
	(1) During the three and nine months ended March 28, 2015, the Company incurred incremental expenses of $16.2 million and $32.9 million, respectively, to effect the Company’s plan to separate into two separate public companies. These incremental expenses included (a) restructuring charges, (b) accounting, legal, and other professional fees, (c) and cost of additional personnel and related costs dedicated to affect the separation and/or to enable Lumentum to operate successfully immediately following the split.

Basis_of_Presentation_Details

Basis of Presentation (Details)	3 Months Ended	12 Months Ended
	Dec. 27, 2014	Jun. 27, 2015	Jun. 28, 2014	Sep. 10, 2014
	item			item
Fiscal years, change in reportable segments and spinoff plans announcement
Number of weeks in fiscal year		364 days	364 days
New reportable segments	2
Number of new public entities				2
Minimum
Fiscal years, change in reportable segments and spinoff plans announcement
Number of weeks in fiscal year		364 days
Maximum
Fiscal years, change in reportable segments and spinoff plans announcement
Number of weeks in fiscal year		371 days

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014	Aug. 21, 2013
Numerator:
Net (loss) income	($13.20)	($1.50)	($48)	$7.60
Denominator:
Basic	233.2	234	232.1	234.1
Effect of dilutive securities from stock-based benefit plans				3.6
Diluted	233.2	234	232.1	237.7
Basic net (loss) income per share from:
Basic	($0.06)	($0.01)	($0.21)	$0.03
Diluted net (loss) income per share from:
Diluted	($0.06)	($0.01)	($0.21)	$0.03
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	14.1	14.8	14.4	4
0.625% Senior Convertible Debentures due 2033 ("notes")
Convertible notes
Interest rate on senior convertible notes (as a percent)	0.63%		0.63%		0.63%
Conversion price of debt (in dollars per share)	$18.83		$18.83
Employee stock options and ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	3.7	4.6	3.8	1.1
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	10.4	10.2	10.6	2.9

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive (Loss) Income (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015
Changes in accumulated other comprehensive (loss) income by component
Beginning balance as of June 28, 2014	$11.10
Other comprehensive (loss) income before reclassification adjustments	-63.4
Amounts reclassified from accumulated other comprehensive (loss) income	0.4
Net current-period other comprehensive (loss) income	-63
Ending balance as of March 28, 2015	-51.9
Tax impact of amortization of actuarial losses	0
Unrealized losses on available-for-sale investments
Changes in accumulated other comprehensive (loss) income by component
Beginning balance as of June 28, 2014	-2.8
Other comprehensive (loss) income before reclassification adjustments	-0.4
Net current-period other comprehensive (loss) income	-0.4
Ending balance as of March 28, 2015	-3.2
Foreign currency translation adjustments
Changes in accumulated other comprehensive (loss) income by component
Beginning balance as of June 28, 2014	26.2
Other comprehensive (loss) income before reclassification adjustments	-63
Net current-period other comprehensive (loss) income	-63
Ending balance as of March 28, 2015	-36.8
Defined benefit obligation, net of tax
Changes in accumulated other comprehensive (loss) income by component
Beginning balance as of June 28, 2014	-12.3
Amounts reclassified from accumulated other comprehensive (loss) income	0.4
Net current-period other comprehensive (loss) income	0.4
Ending balance as of March 28, 2015	($11.90)

Mergers_and_Acquisitions_Detai

Mergers and Acquisitions (Details) (USD $)	0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Dec. 10, 2013	Dec. 27, 2014	Jan. 06, 2014	Mar. 28, 2015	Sep. 27, 2014
Trendium
Acquisitions
Purchase price paid in cash	$26.10
Working capital adjustment and holdback payment	2.5
Additional business acquisition information
Holdback payment		2.5
Maximum period for the holdback payments to be released		1 year
Network Instruments
Acquisitions
Purchase price paid in cash			208.5
Working capital adjustment and holdback payment			20
Additional business acquisition information
Holdback payments, minus any deductions for actual or pending claims to be paid in second tranche				9.9
Period for release of final holdback payment				1 year
Holdback payment					$9.80
Period for release of holdback payments after closing date					6 months

Balance_Sheet_and_Other_Detail2

Balance Sheet and Other Details (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Jun. 28, 2014
Activities and balances for allowance for doubtful accounts and allowance for sales returns
Balance at Beginning of Period	$3.50
Charged to Costs and Expenses	1.9
Adjustments	-1.7
Balance at End of Period	3.7
Inventories
Finished goods	87.5	78.4
Work in process	31.5	40.1
Raw materials	36.8	34.8
Inventories, net	155.8	153.3
Allowance for doubtful accounts
Activities and balances for allowance for doubtful accounts and allowance for sales returns
Balance at Beginning of Period	3
Charged to Costs and Expenses	0.7
Adjustments	-0.7
Balance at End of Period	3
Allowance for sales returns
Activities and balances for allowance for doubtful accounts and allowance for sales returns
Balance at Beginning of Period	0.5
Charged to Costs and Expenses	1.2
Adjustments	-1
Balance at End of Period	$0.70

Balance_Sheet_and_Other_Detail3

Balance Sheet and Other Details (Details 2) (USD $)	Mar. 28, 2015	Jun. 28, 2014
In Millions, unless otherwise specified
Prepayments and Other Current Assets
Prepayments	$34.20	$33.30
Other current assets	46.1	45.4
Prepayments and other current assets	80.3	78.7
Other Current Liabilities
Deferred compensation plan	3.4	3.9
Warranty	4	5.3
Restructuring	18.8	14.5
Holdback liabilities from acquisitions	2.3	22.5
Other	13.3	11.5
Other current liabilities	41.8	57.7
Other Non-Current Liabilities
Pension and post-employment benefits	84.8	107.3
Financing obligation	29.3	31.4
Long-term deferred revenue	27.4	22.7
Other	39.9	58.1
Other non-current liabilities	$181.40	$219.50

Investments_and_Fair_Value_Mea2

Investments and Fair Value Measurements (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014	Jun. 28, 2014
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	$566.50		$566.50		$588.80
Gross Unrealized Gains	0.1		0.1		0.3
Gross Unrealized Losses	-0.3		-0.3		-0.2
Available for Sale Investments at Fair Value	566.3		566.3		588.9
Other-than-temporary impairment loss	0	0	0	0
Contractual maturities of debt securities classified as available-for-sale securities, Amortized cost
Amortized cost of amounts maturing in less than 1 year	413.8		413.8
Amortized cost of amounts maturing in 1-5 years	151.7		151.7
Amortized cost of amounts maturing in more than 5 years	1		1
Total amortized cost of debt available-for-sale securities	566.5		566.5
Contractual maturities of the debt securities classified as available-for-sale securities, Estimated fair value
Estimated fair value amounts maturing in less than 1 year	413.7		413.7
Estimated fair value amounts maturing in 1 -5 years	151.8		151.8
Estimated fair value amounts maturing in more than 5 years	0.8		0.8
Total estimated fair value of debt available-for-sale securities	566.3		566.3
Term of maturities of securities classified as current assets included in short-term investments			12 months
Cash equivalents
Available-For-Sale Investments
Available for Sale Investments at Fair Value	79.2		79.2		39.8
Short-term investment
Available-For-Sale Investments
Available for Sale Investments at Fair Value	486.3		486.3		548.3
Other non-current assets
Available-For-Sale Investments
Available for Sale Investments at Fair Value	0.8		0.8		0.8
Asset-backed securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	75.3		75.3		94.7
Gross Unrealized Gains					0.1
Gross Unrealized Losses	-0.2		-0.2		-0.2
Available for Sale Investments at Fair Value	75.1		75.1		94.6
U.S. treasuries
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	34.9		34.9		36.8
Available for Sale Investments at Fair Value	34.9		34.9		36.8
U.S. Agencies
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	96.3		96.3		70
Available for Sale Investments at Fair Value	96.3		96.3		70
Municipal bonds and sovereign debt instruments
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	11.6		11.6		16.8
Available for Sale Investments at Fair Value	11.6		11.6		16.8
Corporate securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	348.4		348.4		370.5
Gross Unrealized Gains	0.1		0.1		0.2
Gross Unrealized Losses	-0.1		-0.1
Available for Sale Investments at Fair Value	$348.40		$348.40		$370.70

Investments_and_Fair_Value_Mea3

Investments and Fair Value Measurements (Details 2) (Short-term investment, Tradings securities, USD $)	Mar. 28, 2015	Jun. 28, 2014
In Millions, unless otherwise specified
Trading securities related to deferred compensation plan
Deferred compensation plan assets	$3.40	$3.90
Debt securities
Trading securities related to deferred compensation plan
Deferred compensation plan assets	0.4	0.4
Money market instruments and funds
Trading securities related to deferred compensation plan
Deferred compensation plan assets	0.7	0.7
Marketable equity investments
Trading securities related to deferred compensation plan
Deferred compensation plan assets	$2.30	$2.80

Investments_and_Fair_Value_Mea4

Investments and Fair Value Measurements (Details 3) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Jun. 28, 2014
Maximum
Foreign Currency Forward Contracts
Foreign currency forward contracts, expiration period	120 days	120 days
Level 3
Fair Value Measurements
Total debt available-for-sale securities	0	0
Recurring basis | Cash and cash equivalents
Fair Value Measurements
Total assets	212.2
Recurring basis | Short-term investment
Fair Value Measurements
Total assets	489.7
Recurring basis | Restricted cash
Fair Value Measurements
Total assets	26.2
Recurring basis | Other non-current assets
Fair Value Measurements
Total assets	4.6
Recurring basis | Total fair value
Fair Value Measurements
Total debt available-for-sale securities	566.3
Money market funds	163
Trading securities	3.4
Total assets	732.7
Recurring basis | Total fair value | U.S. treasuries
Fair Value Measurements
Total debt available-for-sale securities	34.9
Recurring basis | Total fair value | U.S. Agencies
Fair Value Measurements
Total debt available-for-sale securities	96.3
Recurring basis | Total fair value | Municipal bonds and sovereign debt instruments
Fair Value Measurements
Total debt available-for-sale securities	11.6
Recurring basis | Total fair value | Asset-backed securities
Fair Value Measurements
Total debt available-for-sale securities	75.1
Recurring basis | Total fair value | Corporate securities
Fair Value Measurements
Total debt available-for-sale securities	348.4
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Measurements
Total debt available-for-sale securities	34.9
Money market funds	163
Trading securities	3.4
Total assets	201.3
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries
Fair Value Measurements
Total debt available-for-sale securities	34.9
Recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value Measurements
Total debt available-for-sale securities	531.4
Total assets	531.4
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Agencies
Fair Value Measurements
Total debt available-for-sale securities	96.3
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds and sovereign debt instruments
Fair Value Measurements
Total debt available-for-sale securities	11.6
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Fair Value Measurements
Total debt available-for-sale securities	75.1
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Fair Value Measurements
Total debt available-for-sale securities	348.4

Goodwill_Details

Goodwill (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 27, 2014	Jun. 28, 2014	Mar. 28, 2015
	item
Changes in goodwill
Balance at the beginning of the period	$267		$267
Currency translation adjustments			-8.5
Balance at the end of the period		267	258.5
Number of reporting units	2
Impairment of Goodwill
Impairment of goodwill	0	0
Network Enablement
Changes in goodwill
Balance at the beginning of the period	158		158
Currency translation adjustments			-5.1
Balance at the end of the period			152.9
Service Enablement
Changes in goodwill
Balance at the beginning of the period	94.8		94.8
Currency translation adjustments			-3
Balance at the end of the period			91.8
Optical Security and Performance Products
Changes in goodwill
Balance at the end of the period		8.3	8.3
Communications and Commercial Optical Products
Changes in goodwill
Balance at the beginning of the period	5.9		5.9
Currency translation adjustments			-0.4
Balance at the end of the period			$5.50

Acquired_Developed_Technology_2

Acquired Developed Technology and Other Intangibles (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended
In Millions, unless otherwise specified	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	$743.50		$743.50			$778.20
Accumulated Amortization	-622.1		-622.1			-607.5
Net carrying amount of finite lived intangibles	121.4		121.4			170.7
Net Carrying amount of in-process research and development intangibles	3.5		3.5			7.1
Gross Carrying Amount	747		747			785.3
Intangibles, net	124.9		124.9			177.8
Amortization expenses	15.8	16.2	47	43
Estimated future amortization expense
Remainder of 2015	12		12
2016	37.8		37.8
2017	34.7		34.7
2018	22.2		22.2
2019	10.9		10.9
Thereafter	3.8		3.8
Net carrying amount of intangibles	121.4		121.4
Operating expense | Trendium
Estimated future amortization expense
Impairment charge			1.9		1.9
Acquired developed technology
Acquired developed technology and other intangibles
Gross carrying amount of finite lived intangibles	529		529			548.8
Accumulated Amortization	-456.3		-456.3			-443.1
Net carrying amount of finite lived intangibles	72.7		72.7			105.7
Other
Acquired developed technology and other intangibles
Gross carrying amount of finite lived intangibles	22.5		22.5			24.2
Accumulated Amortization	-21.2		-21.2			-22.1
Net carrying amount of finite lived intangibles	1.3		1.3			2.1
Customer relationships
Acquired developed technology and other intangibles
Gross carrying amount of finite lived intangibles	192		192			205.2
Accumulated Amortization	-144.6		-144.6			-142.3
Net carrying amount of finite lived intangibles	47.4		47.4			62.9
Completed in-process research and development | Network Instruments
Acquired developed technology and other intangibles
Completion of in-process research and development project					$1.70
Useful life of intangible assets					52 months

Debts_and_Letters_of_Credit_De

Debts and Letters of Credit (Detail) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014	Aug. 21, 2013	Jun. 28, 2014
	item		item
Details of the Company's debt:
Effective interest rate (as a percent)	5.40%	5.40%	5.40%	5.40%
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%	5.40%	5.40%
Interest expense-contractual interest	$1	$1	$3	$2.40
Accretion of debt discount	6.3	6	18.8	14.6
Outstanding Letters of Credit
Number of standby letters of credit	11		11
Outstanding balance	30		30		0
Revolving Credit Facility
Debt details
Revolving credit facility terminated					250
Details of the Company's debt:
Unamortized portion of debt issuance cost					1.3
0.625% Senior Convertible Debentures due 2033 ("notes")
Debt details
Conversion price of convertible debt (in dollars per share)	$18.83		$18.83
Amount outstanding	650		650			650
Details of the Company's debt:
Principal amount of 0.625% Senior Convertible Notes	650		650			650
Unamortized discount of liability component	-94.8		-94.8			-113.7
Carrying amount of liability component	555.2		555.2		515.6	536.3
Carrying amount of equity component	134.4		134.4		134.4	134.4
Interest rate on senior convertible notes (as a percent)	0.63%		0.63%		0.63%
Aggregate principal amount of convertible debt					650
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		5-year swap
Remaining term of convertible notes	3 years 4 months 24 days		3 years 4 months 24 days
Deferred finance costs					13.7
Liability component, debt issuance cost					10.9
Equity component, debt issuance cost					2.8
Fair market value of convertible debt	669.2		669.2			653
0.625% Senior Convertible Debentures due 2033 ("notes") | Other non-current assets
Details of the Company's debt:
Unamortized portion of debt issuance cost	$7.70		$7.70

Restructuring_and_Related_Char2

Restructuring and Related Charges (Details) (USD $)	3 Months Ended			9 Months Ended		3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Dec. 27, 2014	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014	Sep. 27, 2014	Dec. 28, 2013	Jun. 28, 2014
		item				item	item	item
Restructuring and Related Charges
Contractual obligations under the operating lease, net of sublease income, fair value	$1.10			$1.10				3.1
New reportable segments		2
Summary of various restructuring plans
Accrual balance at the beginning of the period				26.2		26.2
Restructuring expenses	8.3		3.6	20.9	3.8
Cash Settlements				-18.2
Non-cash settlements and other adjustments				-1.6
Accrual balance at the end of the period	27.3			27.3
Separation Restructuring Plan (Workforce Reduction)
Restructuring and Related Charges
Number of employees expected to be reduced	80
CCOP Robbinsville Closure Plan (Workforce Reduction)
Restructuring and Related Charges
Number of employees expected to be reduced						30
Summary of various restructuring plans
Restructuring expenses	0.1			1.6
Cash Settlements				-1.1
Accrual balance at the end of the period	0.5			0.5
Central Finance and IT Restructuring Plan (Workforce Reduction) | Hologram Business
Restructuring and Related Charges
Number of employees expected to be reduced							20
NE Realignment Plan | Hologram Business
Restructuring and Related Charges
Number of employees expected to be reduced								100
CCOP Serangoon Closure Plan
Summary of various restructuring plans
Accrual balance at the beginning of the period				1.7		1.7
Restructuring expenses	0.3			0.4
Cash Settlements				-1.8
Accrual balance at the end of the period	0.3			0.3
CCOP Serangoon Closure Plan | Hologram Business
Restructuring and Related Charges
Number of employees expected to be reduced								40
Shared Services Restructuring Plan | Hologram Business
Restructuring and Related Charges
Number of employees expected to be reduced								40
NE Product Strategy Restructuring Plan | Hologram Business
Restructuring and Related Charges
Number of employees expected to be reduced			60
Other plans
Summary of various restructuring plans
Accrual balance at the beginning of the period				0.7		0.7
Restructuring expenses	0.1			0.7
Cash Settlements				-1
Accrual balance at the end of the period	0.4			0.4
Plans Prior to Fiscal 2013
Summary of various restructuring plans
Accrual balance at the beginning of the period				2.5		2.5
Restructuring expenses				0.6
Cash Settlements				-1.5
Non-cash settlements and other adjustments				-0.3
Accrual balance at the end of the period	1.3			1.3
Workforce Reduction | Separation Restructuring Plan (Workforce Reduction)
Restructuring and Related Charges
Number of employees expected to be reduced	220
New reportable segments		2
Summary of various restructuring plans
Restructuring expenses	7.4			16.4
Cash Settlements				-4
Non-cash settlements and other adjustments				-0.2
Accrual balance at the end of the period	12.2			12.2
Workforce Reduction | CCOP Robbinsville Closure Plan (Workforce Reduction)
Summary of various restructuring plans
Restructuring expenses				1.5
Cash Settlements				-1.1
Accrual balance at the end of the period	0.4			0.4
Workforce Reduction | Central Finance and IT Restructuring Plan (Workforce Reduction)
Summary of various restructuring plans
Accrual balance at the beginning of the period				1.5		1.5
Cash Settlements				-0.1
Non-cash settlements and other adjustments				-0.3
Accrual balance at the end of the period	1.1			1.1
Workforce Reduction | NE Realignment Plan
Summary of various restructuring plans
Accrual balance at the beginning of the period				4.6		4.6
Restructuring expenses	0.3			0.3
Cash Settlements				-4
Non-cash settlements and other adjustments				-0.1
Accrual balance at the end of the period	0.8			0.8
Workforce Reduction | CCOP Serangoon Closure Plan
Summary of various restructuring plans
Accrual balance at the beginning of the period				1.7		1.7
Restructuring expenses				0.1
Cash Settlements				-1.6
Accrual balance at the end of the period	0.2			0.2
Workforce Reduction | Shared Services Restructuring Plan
Summary of various restructuring plans
Accrual balance at the beginning of the period				1.8		1.8
Restructuring expenses				0.1
Cash Settlements				-0.9
Accrual balance at the end of the period	1			1
Workforce Reduction | NE Product Strategy Restructuring Plan
Summary of various restructuring plans
Accrual balance at the beginning of the period				4.4		4.4
Restructuring expenses				0.4
Cash Settlements				-1.6
Non-cash settlements and other adjustments				-0.7
Accrual balance at the end of the period	2.5			2.5
Ottawa Lease Exit Costs
Summary of various restructuring plans
Accrual balance at the beginning of the period				3.1		3.1
Restructuring expenses	-0.9			-0.9
Cash Settlements				-0.8
Non-cash settlements and other adjustments				-0.3
Accrual balance at the end of the period	1.1			1.1
Lease Costs | CCOP Robbinsville Closure Plan (Workforce Reduction)
Summary of various restructuring plans
Restructuring expenses	0.1			0.1
Accrual balance at the end of the period	0.1			0.1
Lease Costs | CCOP Serangoon Closure Plan
Summary of various restructuring plans
Restructuring expenses	0.3			0.3
Cash Settlements				-0.2
Accrual balance at the end of the period	0.1			0.1
Lease Costs | NE Lease Restructuring Plan (first floor)
Summary of various restructuring plans
Accrual balance at the beginning of the period				6.9		6.9
Restructuring expenses	0.1			0.5
Cash Settlements				-1.8
Accrual balance at the end of the period	5.6			5.6
Lease Costs | NE Lease Restructuring Plan (Lease Costs)
Summary of various restructuring plans
Accrual balance at the beginning of the period				2.1		2.1
Restructuring expenses				-0.1
Cash Settlements				-0.4
Accrual balance at the end of the period	$1.60			$1.60

Restructuring_and_Related_Char3

Restructuring and Related Charges (Details 2) (USD $)	Mar. 28, 2015	Jun. 28, 2014
In Millions, unless otherwise specified
Restructuring accrual
Non-current	$8.50	$11.70
Other lease exit costs
Non-current	$0.60	$2

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Components of the Company's income tax (benefit) expense
Income tax benefit	($17.40)	($17.20)	($2.50)	($13.70)
Uncertain tax benefits related to the settlement of an audit/deferred tax assets due to the expiration of the statute of limitations in a non-US jurisdiction and/or other similar nature	21.8		21.8	21.7
Income tax benefit intraperiod tax allocation related to other comprehensive income				$5.10

Income_Taxes_Details_2

Income Taxes (Details 2) (USD $)	Mar. 28, 2015	Jun. 28, 2014
In Millions, unless otherwise specified
Income Taxes
Unrecognized tax benefits	$38.30	$60.30
Accrued interest and penalties related to unrecognized tax benefits	1.6
Unrecognized tax benefits that may be recognized during the next twelve months	$0.30

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014	Mar. 27, 2015
Impact on the entity's results of operations of recording stock-based compensation by function
Stock-based compensation cost (in dollars)	$19.60	$16.90	$50.30	$48.30
Stock-based compensation capitalized to inventory (in dollars)			1.9
Modification
Impact on the entity's results of operations of recording stock-based compensation by function
Stock-based compensation cost (in dollars)	3.2		4.9
Extended exercise period for fully exercisable options resulted from modification					2 years
Total incremental Share-based compensation resulted from modification			6.3
Cost of sales
Impact on the entity's results of operations of recording stock-based compensation by function
Stock-based compensation cost (in dollars)	2.3	2.7	7	7.7
Research and development
Impact on the entity's results of operations of recording stock-based compensation by function
Stock-based compensation cost (in dollars)	3.9	4.1	11.5	11.7
Selling, general and administrative
Impact on the entity's results of operations of recording stock-based compensation by function
Stock-based compensation cost (in dollars)	13.4	10.1	31.8	28.9
Full Value Awards - Total
Impact on the entity's results of operations of recording stock-based compensation by function
Vesting period			3 years
Unrecognized stock-based compensation	83.9		83.9
Estimated amortization period			2 years 1 month 6 days
Exercise price (in dollars per share)	$0		$0
Withholding taxes liability paid			17.2	18.3
Full Value Awards - Total | Minimum
Impact on the entity's results of operations of recording stock-based compensation by function
Vesting period			1 year
Full Value Awards - Total | Maximum
Impact on the entity's results of operations of recording stock-based compensation by function
Vesting period			4 years
RSUs
Impact on the entity's results of operations of recording stock-based compensation by function
Granted (in shares)			5.6	5.5
Restricted Stock Units with Time-based Conditions
Impact on the entity's results of operations of recording stock-based compensation by function
Vesting period			3 years
Granted (in shares)			4.9	4.9
Percentage of first tranche vested			33.00%
Initial vesting period			1 year
Subsequent vesting period			2 years
Restricted Stock Units with Market Conditions (MSU)
Impact on the entity's results of operations of recording stock-based compensation by function
Granted (in shares)			0.7	0.6
Aggregate grant-date fair value (in dollars)			$9.40	$9.20

StockBased_Compensation_Detail1

Stock-Based Compensation (Details 2) (MSUs, Monte Carlo simulation)	9 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
MSUs | Monte Carlo simulation
Valuation Assumptions
Volatility (as a percent)	40.80%	53.90%
Average volatility of peer companies (as a percent)	53.40%	58.60%
Average correlation coefficient of peer companies	0.2156	0.292
Risk-free interest rate (as a percent)	0.60%	0.80%

Employee_Defined_Benefit_Plans2

Employee Defined Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Components of the net periodic cost for the pension and benefits plans
Service cost	$0.10	$0.20	$0.40	$0.40
Interest cost	0.9	1.2	2.9	3.6
Expected return on plan assets	-0.5	-0.4	-1.3	-1.2
Recognized net actuarial (gains)/losses	0.1		0.4	0.1
Net periodic benefit cost	0.6	1	2.4	2.9
Defined benefit plan contribution during fiscal year			4.4
Pension Benefit Plans
Change in plan assets:
Contribution incurred			4.7
UK pension plan
Change in plan assets:
Employer contributions			1.1
Switzerland pension plan
Change in plan assets:
Employer contributions			$0.40

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Changes in warranty reserve
Balance as of beginning of period	$5.40	$6.80	$6.30	$6.90
Provision for warranty	1.6	1.7	4.5	6.3
Utilization of reserve	-0.8	-1.2	-4.4	-4.3
Adjustments related to pre-existing warranties (including changes in estimates)	-0.8	-0.4	-1	-2
Balance as of end of period	$5.40	$6.90	$5.40	$6.90
Minimum
Product Warranties
Warranty Term for most products			3 months
Maximum
Product Warranties
Warranty Term for most products			1 year

Operating_Segments_Details

Operating Segments (Details) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Sep. 27, 2014	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
		item
Net revenue:
Net Revenue	$410.70		$418	$1,281.40	$1,294.60
Total net revenue	410.7		418	1,281.40	1,294.60
Operating income (loss):
Total operating income	31.3		27.2	113.9	111.8
Unallocated amounts:
Restructuring and related charges	-8.3		-3.6	-20.9	-3.8
Interest and other income (expense), net	0.3		0.6	1.2	0.4
Interest expense	-8.6		-7.7	-25.4	-21.3
Loss before income taxes	-30.6		-18.7	-50.5	-6.1
Realignment and other charges	16.2			32.9
Number of reporting units		2
Corporate
Operating income (loss):
Total operating income	-21.5		-23.3	-66.2	-70.7
Segment Reconciling Items
Unallocated amounts:
Stock-based compensation	-19.6		-16.9	-50.3	-48.3
Amortization of intangibles	-15.8		-16.2	-47	-43
Loss (gain) on disposal of long-lived assets	-0.5		-1	-0.5	-0.8
Restructuring and related charges	-8.3		-3.6	-20.9	-3.8
Other charges related to non-recurring activities	-9.4		-1.1	-21.5	-1.1
Interest and other income (expense), net	0.3		0.6	1.2	0.4
Interest expense	-8.6		-7.7	-25.4	-21.3
Loss before income taxes	-30.6		-18.7	-50.5	-6.1
Network Enablement
Net revenue:
Net Revenue	128.1		136	394.6	436.9
Operating income (loss):
Total operating income	25.8		18.7	68.4	72.1
Service Enablement
Net revenue:
Net Revenue	39		36.3	132.9	102.3
Operating income (loss):
Total operating income	-9.5		-8.8	-11.2	-20.9
Communications and Commercial Optical Products
Net revenue:
Net Revenue	195.2		194.6	611.6	597.2
Operating income (loss):
Total operating income	17.4		22.4	69.1	73.5
Optical Security and Performance Products
Net revenue:
Net Revenue	48.4		51.1	142.3	158.2
Operating income (loss):
Total operating income	$19.10		$18.20	$53.80	$57.80