Basis of presentation and general information.

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Business relationship agreement period.

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Customer contract period.

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Number of customers accounted for more than five percent of revenue.

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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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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. 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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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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Aggregate dividends declared during the period for each share of common stock outstanding.

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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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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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

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

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Basis of Presentation and General Information (Narrative) (Details) $ / shares in Units, shares in Millions		1 Months Ended	12 Months Ended
	Mar. 08, 2019 $ / shares	Dec. 31, 2012 $ / shares	Dec. 28, 2018 USD ($) customer segment $ / shares shares	Dec. 29, 2017 USD ($) customer $ / shares shares	Dec. 30, 2016 USD ($) customer $ / shares shares	Dec. 29, 2018 USD ($)
Basis Of Presentation And General Information [Line Items]
Dividend declared \| $ / shares		$ 0.10	$ 0.34	$ 0.30	$ 0.26
Period of intangible assets amortized			5 years
Amortization expense			$ 2,369,000	$ 2,090,000	$ 1,100,000
Future amortization expense, 2019			1,100,000
Future amortization expense, 2020			1,000,000
Future amortization expense, 2021			900,000
Future amortization expense, 2022			100,000
Revenue recognized as a result of change in contract liability			19,100,000	23,700,000
Deferred commissions			1,200,000	1,400,000
Commissions expense			1,400,000	$ 1,500,000
Impairment loss recognized to capitalization of deferred commission			$ 0
Antidilutive common share equivalents \| shares			0.7	0.8	0.8
Number of customers accounted for more than five percent of revenue \| customer			0	0	0
Number of operating segments \| segment			1
Minimum [Member]
Basis Of Presentation And General Information [Line Items]
Useful life of property and equipment			3 years
Business relationship agreement period			6 months
Maximum [Member]
Basis Of Presentation And General Information [Line Items]
Useful life of property and equipment			10 years
Business relationship agreement period			12 months
Customer contract period			12 months
Subsequent Event [Member]
Basis Of Presentation And General Information [Line Items]
Dividend declared \| $ / shares	$ 0.36
Additional operating liabilities						$ 9,000,000
Additional operating ROU						$ 9,000,000