Organization and Description of Business - Summary of List of Entities in Operation (Details)	6 Months Ended
Jun. 30, 2026
GEN Tustin [Member] \| GEN Restaurant Group LLC [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Huntington Beach [Member] \| GEN Restaurant Group LLC [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Oxnard [Member] \| GEN Restaurant Group LLC [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Henderson [Member] \| JC Group International Inc. (S Corp) [Member] \| NV
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Corona [Member] \| JC Group International Inc. (S Corp) [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Glendale [Member] \| GEN Restaurant Investment LLC [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Fullerton [Member] \| GEN California LLC [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Mira Mesa [Member] \| GEN California LLC [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Tempe [Member] \| GEN Arizona LLC [Member] \| AZ
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Chandler [Member] \| GEN Chandler LLC [Member] \| AZ
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Sahara [Member] \| GEN Nevada LLC [Member] \| NV
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Miracle Mile [Member] \| GEN Nevada LLC [Member] \| NV
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Alhambra [Member] \| GEN Alhambra LLC [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Arlington [Member] \| GEN Arlington, LP [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Cerritos [Member] \| GEN Cerritos LLC [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
Gen Cerritos II [Member] \| GEN Cerritos II LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Torrance [Member] \| GEN Torrance LLC [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Rancho Cucamonga [Member] \| GEN Rancho Cucamonga LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN San Jose [Member] \| GEN San Jose LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Northridge [Member] \| GEN Northridge LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Chino Hills [Member] \| GEN Chino Hills LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Carrollton [Member] \| GEN Carrollton LP [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Fort Lauderdale [Member] \| GEN Fort Lauderdale LP [Member] \| FL
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Fremont [Member] \| GEN Fremont LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Concord [Member] \| GEN Concord, LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Webster [Member] \| GEN Webster, LP [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Westgate [Member] \| GEN Westgate, LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Westheimer [Member] \| GEN Westheimer, LLC [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Manhattan [Member] \| GEN Manhattan NYU, LP [Member] \| NY
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Maui [Member] \| GEN Maui, LP [Member] \| HI
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Korean BBQ [Member] \| GKBH Restaurant, LLC [Member] \| HI
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
Investment Company [Member] \| GEN Hawaii, LLC [Member] \| HI
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Management of GKBH
Investment Company [Member] \| GEN Texas, LLC [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Management of GEN Houston and GEN Webster
GEN Online [Member] \| GEN Online, LLC [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Website sales
AZGC [Member] \| GEN Arizona Gift Cards, LLC [Member] \| AZ
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Gift card Management Company
Operating Company [Member] \| GEN Restaurant Companies, LLC [Member] \| DE
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Operating Company of Public Entity
GEN Sacramento [Member] \| GEN Sacramento, LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Pearlridge [Member] \| GEN Pearlridge, LLC [Member] \| HI
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Kapolei [Member] \| GEN Kapolei, LP [Member] \| HI
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Frisco [Member] \| GEN Frisco, LP [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Houston [Member] \| GEN Houston, LLC [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
Gen Seattle [Member] \| Gen Seattle, LP [Member] \| WA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Dallas [Member] \| GEN Dallas, LP [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Pflugerville [Member] \| GEN Pflugerville, LP [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Tigard [Member] \| GEN Tigard, LP [Member] \| OR
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Grills [Member] \| GEN Grills, LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Special Events
GEN Orlando [Member] \| GEN Orlando, LP [Member] \| FL
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Austin [Member] \| GEN Austin, LP [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
Kan Sushi [Member] \| Kan Sushi Austin, LP [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Cary [Member] \| GEN Cary , LP [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
Holding Company [Member] \| GEN Master, LLC [Member] \| NY
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Management
GEN K [Member] \| GEN K, LLC [Member] \| Korea
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Management of South Korean Restaurant
GRM [Member] \| GEN Restaurant Management, LLC [Member] \| DE
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Management
GEN Waco [Member] \| GEN Waco LP [member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restauran
GEN La Jolla [Member] \| GEN San Diego, LP [Member] \| CA
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restauran
GEN Sadang [Member] \| GEN K Sadang, LLC [Member] \| Korea
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Wirye [Member] \| GEN K Wiyre, LLC [Member] \| Korea
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
Kan Wiyre [Member] \| GEN K Wiyre, LLC [Member] \| Korea
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN McAllen [Member] \| GEN McAllen, LLC [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN El Paso [Member] \| GEN El Paso LP [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Ilsan [Member] \| GEN K Ilsan, LLC [Member] \| Korea
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Tucson [Member] \| GEN Tucson, LP [Member] \| AZ
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant
GEN Denton [Member] \| GEN Denton, LP [Member] \| TX
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Purpose	Restaurant

GEN Tustin [Member] | GEN Restaurant Group LLC [Member] | CA