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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Commitments and Contingencies (Details) $ in Thousands			12 Months Ended
Commitments and Contingencies (Details) $ in Thousands	Jul. 16, 2014 patent	Jan. 21, 2014 patent	Dec. 31, 2016 USD ($)	Jan. 02, 2016 USD ($)	Jan. 03, 2015 USD ($)
Operating Leases
Rent expense under operating leases			$ 4,700	$ 4,600	$ 4,200
Minimum annual future rentals
2017			5,139
2018			3,852
2019			2,700
2020			2,432
2021			2,286
Thereafter			4,638
Total minimum lease payments			$ 21,047
Cresta Technology
Patent Litigation
Number of patents allegedly infringed \| patent	6	3