Summary of Significant Accounting Policies Business (Details)	12 Months Ended
	Dec. 31, 2016 stores	Jan. 02, 2016	Jan. 03, 2015
Entity Location [Line Items]
Number of Stores	254
Number of States in which Entity Operates	38
Merchandise product categories	100.00%	100.00%	100.00%
Core Boating Products [Member]
Entity Location [Line Items]
Merchandise product categories	76.50%	77.10%	81.30%
Merchandise Expansion Products [Member]
Entity Location [Line Items]
Merchandise product categories	23.50%	22.90%	18.70%