Related Party Transactions: (Details) (USD $)	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Related party transactions
Stock Repurchased and Retired During Period, Value	$ 11,564,800	$ 1,854,900	$ 7,220,300
Dean B. Phillips \| Common Stock
Related party transactions
Stock Repurchased and Retired During Period, Shares			16,000
Stock Repurchased and Retired During Period, Value			$ 889,600
Repurchase price per share (in dollars per share)			$ 55.60

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Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

+ Details

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- Definition

The price paid per share for shares repurchased and retired during the period.

+ References

No definition available.

+ Details

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- Details

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