| Cover | Mar. 23, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 23, 2021 |
| Entity File Number | 001-36823 |
| Entity Registrant Name | SHAKE SHACK INC. |
| Entity Central Index Key | 0001620533 |
| Entity Tax Identification Number | 47-1941186 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 225 Varick Street |
| Entity Address, Address Line Two | Suite 301 |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10014 |
| City Area Code | 646 |
| Local Phone Number | 747-7200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, par value $0.001 |
| Trading Symbol | SHAK |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
