Share-based Compensation Plans - Annualized weighted average values of significant assumptions of the options granted (Details) (USD $)	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013
Compensation and Retirement Disclosure [Abstract]
Risk-free interest rate	0.91%	1.62%
Risk-free interest rate high	2.16%
Expected life in years	9 years	9 years
Expected volatility	5.30%	5.30%
Expected dividend yield
Weighted average fair value of grants	$ 1.74	$ 0.60

No authoritative reference available.

No definition available.

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- Details

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- Definition

Amount of dividends expected to be paid to holders of the underlying shares or contracted instruments over the term of the instruments life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

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- Definition

Weighted average grant-date fair value of options vested.

+ References

No definition available.

+ Details

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