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Restructuring and Related Charges - Activities in Restructuring Accrual (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2016 | Jul. 03, 2015 | Jul. 01, 2016 | Jul. 03, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Product cost of revenue | $ 6 | $ 0 | $ (23) | $ 0 |  |
Restructuring and related charges | 1,903 | 185 | 4,515 | 229 |  |
Total restructuring and related charges | 1,909 | $ 185 | 4,492 | $ 229 |  |
Harmonic 2016 Restructuring Plan [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  | 4,557 |  |  |
Adjustment to restructuring provisions |  |  | 1,087 |  |  |
Cash payments |  |  | (1,799) |  |  |
Non-cash write-offs |  |  | (246) |  |  |
Foreign exchange gain (loss) |  |  | (5) |  |  |
Ending Balance | 3,594 |  | 3,594 |  |  |
Harmonic 2016 Restructuring Plan [Member] | Other Restructuring [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Total restructuring and related charges |  |  | 200 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  | 246 |  |  |
Adjustment to restructuring provisions |  |  | 0 |  |  |
Cash payments |  |  | 0 |  |  |
Non-cash write-offs |  |  | (246) |  |  |
Ending Balance | 0 |  | 0 |  |  |
Harmonic 2016 Restructuring Plan [Member] | Facility Closing [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Total restructuring and related charges |  |  | 1,400 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges | 1,400 |  | 1,418 |  |  |
Adjustment to restructuring provisions |  |  | 1,087 |  |  |
Cash payments |  |  | (468) |  |  |
Non-cash write-offs |  |  | 0 |  |  |
Ending Balance | 2,037 |  | 2,037 |  |  |
Harmonic 2016 Restructuring Plan [Member] | Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Total restructuring and related charges | 1,900 |  | 3,000 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  | 2,893 |  |  |
Adjustment to restructuring provisions |  |  | 0 |  |  |
Cash payments |  |  | (1,331) |  |  |
Non-cash write-offs |  |  | 0 |  |  |
Foreign exchange gain (loss) |  |  | (5) |  |  |
Ending Balance | 1,557 |  | 1,557 |  |  |
Harmonic Two Thousand And Fifteen Restructuring [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring charges |  |  |  |  | $ 2,200 | $ 1,500
Harmonic Two Thousand And Fifteen Restructuring [Member] | Employee Severance [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 264 |  |  |
Adjustment to restructuring provisions |  |  | (65) |  |  |
Cash payments | (194) |  |  |  |  |
Ending Balance | $ 5 |  | $ 5 |  | $ 264 |

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- Definition Amount of (expense) reversal of expense related to a previously accrued restructuring cost liability. Excludes adjustments for costs incurred, costs settled, and foreign currency translation adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394291&loc=d3e17658-110867 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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