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Balance Sheet Details - Schedule of Other Non-Current Liabilities (Details) - USD ($) $ in Thousands | Mar. 27, 2021 | Dec. 26, 2020
--- | --- | ---
Other Liabilities Noncurrent [Abstract] |  |
Non-current operating lease obligations | $ 17,203 | $ 16,455
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | onto:OperatingLeaseLiabilityNonCurrentMember | onto:OperatingLeaseLiabilityNonCurrentMember
Unrecognized tax benefits (including interest) | $ 4,002 | $ 3,812
Deferred revenue | 1,005 | 1,292
Other | 6,527 | 6,153
Total other non-current liabilities | $ 28,737 | $ 27,712

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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