Summary of Significant Accounting Policies-Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Cash paid during the year for:
Interest	$ 469us-gaap_InterestPaidNet	$ 28us-gaap_InterestPaidNet	$ 44us-gaap_InterestPaidNet
Income taxes	19,863us-gaap_IncomeTaxesPaid	29,979us-gaap_IncomeTaxesPaid	28,691us-gaap_IncomeTaxesPaid
Noncash investing and financing activities:
Assets acquired under capital leases	0us-gaap_CapitalLeaseObligationsIncurred	352us-gaap_CapitalLeaseObligationsIncurred	21us-gaap_CapitalLeaseObligationsIncurred
Unpaid purchases of property, plant and equipment	$ 12,155	$ 507	$ 776

Future cash outflow to pay for purchases of fixed assets that have occurred.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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The increase during the period in capital lease obligations due to entering into new capital leases.

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