Amortization of stock based compensation.

No definition available.

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- Definition

Closing price of common stock.

+ References

No definition available.

+ Details

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- Definition

Range Of Shares Issued Upon Restated Stock Option And Incentive Plan

+ References

No definition available.

+ Details

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- Definition

Stock Options Granted To Named Executives

+ References

No definition available.

+ Details

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Stockholders' Equity - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended		3 Months Ended
	Mar. 28, 2015	Dec. 28, 2013	Dec. 27, 2014	Mar. 29, 2014	Mar. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted options to employees to purchase shares of common stock (in shares)	15,700,000
Closing price of common stock (in usd per share)					$ 19.59infn_ClosingPriceOfCommonStock
SPGIIPTR Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant cost (in shares)	200,000
NASDAQ Telecom Composite Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant cost (in shares)		600,000
IGN Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant cost (in shares)			300,000
Performance Stock Unit Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization of stock-based compensation	0.9			$ 0.4
Shares of PSUs to executive officers (in shares)	100,000
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant cost (in shares)	438,000
PSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges of number of shares issued on vesting of PSUs	0
PSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges of number of shares issued on vesting of PSUs	1.5
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant cost (in shares)	1,581,000
Amortization of stock-based compensation	5.2			$ 5.1
Two Thousand And Seven Equity Incentive Plan [Member] \| NASDAQ Telecom Composite Index \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges of number of shares issued on vesting of PSUs	0
Two Thousand And Seven Equity Incentive Plan [Member] \| NASDAQ Telecom Composite Index \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges of number of shares issued on vesting of PSUs	1.5
Two Thousand And Seven Equity Incentive Plan [Member] \| IGN Index \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges of number of shares issued on vesting of PSUs	1.5