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Basis of Presentation and General Information (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Dec. 29, 2018	Dec. 28, 2018	Dec. 29, 2017
Basis Of Presentation And General Information [Line Items]
Revenue recognized as a result of change in contract liability	$ 4,000,000	$ 4,800,000
Deferred commissions				$ 1,200,000	$ 1,400,000
Commissions expense	300,000	100,000
Impairment loss recognized to capitalization of deferred commission	0	$ 0
Additional operating liabilities	8,301,000		$ 9,000,000
Additional operating ROU	$ 8,301,000		$ 9,000,000
Minimum [Member]
Basis Of Presentation And General Information [Line Items]
Business relationship agreement period	6 months
Maximum [Member]
Basis Of Presentation And General Information [Line Items]
Business relationship agreement period	12 months
Customer contract period	12 months

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Basis of presentation and general information.

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Business relationship agreement period.

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The amount of expense recognized in the current period for the periodic realization of capitalized fees that were paid to salespeople, distributors, brokers, and agents at the time of the conclusion of the sale. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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-Name Accounting Standards Codification
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-SubTopic 10
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Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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

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

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