Related Party Transactions	3 Months Ended
	Apr. 03, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company engaged Jefferies LLC ("Jefferies"), an affiliate of one of the current members of Fiesta's board of directors, and a subsidiary of Jefferies Financial Group, Inc, a holder of more than 20 percent of the total outstanding shares of Fiesta, in connection with a refinancing of the Company's former amended senior credit facility in 2020 and other advisory services including related to the sale of Taco Cabana. The Company paid fees of $1.7 million to Jefferies and reimbursed Jefferies for reasonable out of pocket and ancillary expenses of less than $0.1 million when the refinancing was completed in the fourth quarter of 2020. The Company paid Jefferies a transaction advisory fee of $2.0 million upon the sale of Taco Cabana. As of April 3, 2022 and January 2, 2022, there were no amounts due to the related party recognized on the condensed consolidated balance sheets.