Stockholders' Equity Stockholders' Equity (Details Textuals) - $ / shares	12 Months Ended
	Dec. 27, 2016	Dec. 29, 2015	Dec. 30, 2014
Class of Stock [Line Items]
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock Class A [Member]
Class of Stock [Line Items]
Common Stock Voting Rights Number	1
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	3,175,433
Common Stock Class B [Member]
Class of Stock [Line Items]
Common Stock Voting Rights Number	3
Common Stock Conversion Ratio	1
Common Stock [Member] | Common Stock Class B [Member] | Board of Directors Chairman [Member]
Class of Stock [Line Items]
Percentage of Shares Owned By Chairman	94.90%
Restricted Stock [Member]
Class of Stock [Line Items]
Treasury Shares Acquired Surrendered by Participants	27,478	28,018	35,461
Treasury Stock Acquired, Average Cost Per Share	$ 216.42	$ 196.78	$ 151.17