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Equity Interest Investments - Earnings of affiliates (Details) - USD ($)
$ in Thousands
2 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended
May 17, 2018
Jul. 13, 2019
Jul. 14, 2018
May 17, 2018
Jul. 13, 2019
Jul. 14, 2018
Schedule of Equity Method Investments [Line Items]            
Equity in earnings of affiliates   $ 0 $ 133   $ 0 $ 121
Stiga Sports AB            
Schedule of Equity Method Investments [Line Items]            
Equity in earnings of affiliates $ 133     $ 121