Supplemental Disclosures to Consolidated Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 30, 2014	Dec. 31, 2013	Jan. 01, 2013
Supplemental Cash Flow Elements [Abstract]
Interest paid (net of amounts capitalized)	$ 0us-gaap_InterestPaidNet	$ 2,506us-gaap_InterestPaidNet	$ 4,400us-gaap_InterestPaidNet
Income taxes paid (net of refunds)	811us-gaap_IncomeTaxesPaid	137us-gaap_IncomeTaxesPaid	509us-gaap_IncomeTaxesPaid
Purchases of property and equipment accrued in accounts payable	$ 37	$ 996	$ 2,648

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 50

-Paragraph 4

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Subparagraph (f)

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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