Statement of cash flow supplementary information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 26, 2014	Dec. 27, 2013
Supplemental cash flow disclosures of non-cash investing and financing activities [Abstract]
Capital expenditures included in accounts payable	$ 443	$ 391
Debt issuance costs included in accounts payable	694	1,508
Conversion of senior convertible notes to common stock	3,477	0
Cash payments made during the year:
Income taxes	4,117us-gaap_IncomeTaxesPaid	3,257us-gaap_IncomeTaxesPaid
Interest	$ 1,328us-gaap_InterestPaid	$ 3,436us-gaap_InterestPaid

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The amount of debt issuance costs that were incurred during a noncash or partial noncash transaction.

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

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The amount of cash paid for interest during the period.

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