Accounting policies.

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Minimum percentage criteria of indefinite lived intangible assets fair value over carrying value.

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Number of significant customers.

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Represents the planned future payment to existing stockholders as percentage of cash saving.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

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Unsecured short-term debt instrument issued by corporations which are highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016 USD ($) Customer	Jan. 02, 2016 USD ($)	Jan. 03, 2015 USD ($)	Oct. 01, 2016 USD ($)	Oct. 03, 2015 USD ($)	Sep. 27, 2014 USD ($)
Accounting Policies [Line Items]
Fiscal Period Duration		364 days	364 days	371 days
Bank Overdrafts		$ 2,686,000	$ 4,588,000
Short term money market investments		45,959,000	0
Commercial paper investments		56,967,000	0
Goodwill impairment charges		0	0	$ 0	$ 0	$ 0	$ 0
Minimum percentage criteria of Indefinite-lived intangible assets fair value over it's carrying amount				300.00%
Indefinite-lived intangible assets impairment charges		0	0	$ 0
Advertising expense		2,182,000	1,523,000	986,000
Research and development expense		$ 8,946,000	6,551,000	$ 5,991,000
IPO [Member]
Accounting Policies [Line Items]
Expected future payment to existing stockholders, as percent of cash saving (as a percent)		85.00%
ASU 2015-03 [Member]
Accounting Policies [Line Items]
Long-term assets		$ (11,638,000)	(11,071,000)
Long-term debt		(11,638,000)	(11,071,000)
Scenario Forecast [Member]
Accounting Policies [Line Items]
Fiscal Period Duration	364 days
Foodservice [Member] \| Customer Concentration Risk [Member] \| Major Customers [Member]
Accounting Policies [Line Items]
Aggregate Accounts Receivable Balances		$ 22,627,000	$ 23,234,000
Foodservice [Member] \| Customer Concentration Risk [Member] \| Net Sales [Member] \| Customer One [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage		13.70%	13.60%	12.90%
Foodservice [Member] \| Customer Concentration Risk [Member] \| Net Sales [Member] \| Customer Two [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage		12.30%	12.00%	12.20%
Foodservice [Member] \| Customer Concentration Risk [Member] \| Net Sales [Member] \| Customer Three [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage		10.80%	9.90%	10.10%
Foodservice [Member] \| Customer Concentration Risk [Member] \| Net Sales [Member] \| Major Customers [Member]
Accounting Policies [Line Items]
Number of significant customers \| Customer		3