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Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Jun. 29, 2020	Dec. 30, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 21,993	$ 22,173
Other current liabilities	$ 7,641	$ 7,111
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities	$ 15,015	$ 15,413
Total operating lease liabilities	$ 22,656	$ 22,524
Weighted average remaining lease term	4 years 1 month 6 days	4 years 4 months 24 days
Weighted average discount rate	3.76%	3.92%

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Indicates line item in statement of financial position that includes current operating lease liability.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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