Related Party Transactions	12 Months Ended
	Jan. 02, 2022
Related Party Transactions [Abstract]
Related Party Transactions Disclosure	Related Party TransactionsThe 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 services 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 2020. The Company paid Jefferies a transaction fee of $2.0 million upon the sale of Taco Cabana in the third quarter of 2021. As of January 2, 2022 and January 3, 2021, there were no amounts due to the related party recognized on the consolidated balance sheets.