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Credit Facilities - Additional Information (Detail) (USD $) | 9 Months Ended | 8 Months Ended |  | 9 Months Ended | 4 Months Ended
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Sep. 26, 2014 | Aug. 21, 2014 LIBOR [Member] | Sep. 26, 2014 LIBOR [Member] | Sep. 26, 2014 Standby letters of credit [Member] | Sep. 26, 2014 Line of credit facility [Member] | Sep. 26, 2014 Minimum [Member] | Sep. 26, 2014 Minimum [Member] LIBOR [Member] | Sep. 26, 2014 Maximum [Member] LIBOR [Member] | Dec. 31, 2014 Subsequent Event [Member] LIBOR [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant, Certain Assets to Certain Liabilities Less Deferred Revenue Ratio | 3.26 |  |  |  |  | 1.75 |  |  |
Maximum borrowing capacity under bank line of credit facility | $ 10,000,000 |  |  | $ 200,000 |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | 9,800,000 |  |  |  |
Line of Credit Facility, Covenant Terms | 3.26 to 1 |  |  |  |  |  |  |  |
Bank line of credit facility, maturity date | Dec. 31, 2014 |  |  |  |  |  |  |  |
Unrestricted Cash Cash Equivalents And Short Term Investments To Current Liabilities Ratio | Harmonic to maintain a ratio of unrestricted cash, accounts receivable and short term investments to current liabilities (less deferred revenue) of at least 1.75 to 1.00. |  |  |  |  |  |  |  |
Line of Credit LIBOR margin |  | 1.75% |  |  |  |  | 1.50% | 1.65% | 1.50%
Borrowings under bank line of credit facility | $ 0 |  |  |  |  |  |  |  |
Bank's Prime Rate | 3.25% |  |  |  |  |  |  |  |
Annualized rate of LIBOR |  |  | 0.15% |  |  |  |  |  |
LIBOR rate duration | one month borrowing period at September 26, 2014 |  |  |  |  |  |  |  |
Credit facility collateral | Borrowings are not collateralized |  |  |  |  |  |  |  |
Covenants under the line of credit facility | As of September 26, 2014, Harmonic was in compliance with the covenants under the line of credit facility |  |  |  |  |  |  |  |

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- Definition Line of Credit Facility, Covenant, Certain Assets to Certain Liabilities Less Deferred Revenue Ratio + References No definition available. + Details
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- Definition Unrestricted cash cash equivalents and short term investments to current liabilities ratio. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Discussion of whether the borrowings under the credit facility are secured or unsecured and, if secured, a description of collateral (for example, accounts receivable less than 120 days old, finished goods inventory). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Identification of whether the entity has been in compliance with any credit facility debt covenants during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the conditions for borrowing under the credit facility including the nature of any restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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