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