Equity Interest Investments (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Schedule of Equity Method Investments [Line Items]
Current assets	$ 80,260	$ 75,623
Total assets	156,105	150,761	$ 143,737
Current liabilities	19,542	18,418
Total liabilities	44,435	49,048
Stiga Sports AB [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	30,623	28,322
Non-current assets	10,854	9,379
Total assets	41,477	37,701
Current liabilities	6,897	4,847
Non-current liabilities	5,462	5,133
Total liabilities	12,359	9,980
Net assets	$ 29,118	$ 27,721