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Advertising Fund Assets	3 Months Ended
Advertising Fund Assets	Mar. 24, 2019
Advertising Fund Assets [Abstract]
Advertising Fund Assets	10. Advertising Fund Assets As of March 24, 2019, advertising fund assets, restricted of $98.1 million consisted of $84.4 million of cash, cash equivalents and investments, $12.1 million of accounts receivable and $1.6 million of prepaid expenses. As of March 24, 2019, advertising fund cash, cash equivalents and investments included $5.1 million of cash contributed from Company-owned stores that had not yet been expended. As of December 30, 2018, advertising fund assets, restricted of $112.7 million consisted of $95.1 million of cash, cash equivalents and investments, $15.3 million of accounts receivable and $2.3 million of prepaid expenses. As of December 30, 2018, advertising fund cash, cash equivalents and investments included $5.5 million of cash contributed from Company-owned stores that had not yet been expended.