Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jul. 01, 2015
Accounting Policies [Abstract]
Basis of presentation	The accompanying unaudited condensed consolidated financial statements include the accounts of Shake Shack Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. These interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and on a basis consistent in all material respects with the accounting policies described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014 ("2014 Form 10-K"). In our opinion, all adjustments, which are normal and recurring in nature, necessary for a fair presentation of our financial position and results of operation have been included. Certain reclassifications have been made to prior period amounts to conform to the current year presentation. Operating results for interim periods are not necessarily indicative of the results that may be expected for a full fiscal year. The accompanying Condensed Consolidated Balance Sheet as of December 31, 2014 has been derived from the audited financial statements at that date but does not include all of the disclosures required by GAAP. These interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes thereto included in our 2014 Form 10-K. We do not have any components of other comprehensive income recorded within our condensed consolidated financial statements, and, therefore, do not separately present a statement of comprehensive income in our condensed consolidated financial statements.
Fiscal year	We operate on a 52/53 week fiscal year ending on the last Wednesday in December. Fiscal 2015 contains 52 weeks and ends on December 30, 2015. Fiscal 2014 contained 53 weeks and ended on December 31, 2014. Unless otherwise stated, references to years in this report relate to fiscal years.
Use of estimates	The preparation of these condensed consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of sales and expenses during the reporting period. Actual results could differ from those estimates.
Recently issued accounting pronouncements	In July 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update No. 2015-11, Simplifying the Measurement of Inventory ("ASU 2015-11"). Under ASU 2015-11 entities should measure inventory that is not measured using last-in, first-out (LIFO) or the retail inventory method, including inventory that is measured using first-in, first-out (FIFO) or average cost, at the lower of cost or net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. ASU 2015-11 is effective for reporting periods beginning after December 15, 2016 and is to be applied prospectively. The adoption of ASU 2015-11 is not expected to have a material effect on our consolidated financial position, results of operations or cash flows. In April 2015, the FASB issued Accounting Standards Update No. 2015-05, Customers' Accounting for Fees Paid in a Cloud Computing Arrangement ("ASU 2015-05"). ASU 2015-05 provides guidance in evaluating whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the software license element of the arrangement should be accounted for as an acquisition of a software license. If the arrangement does not contain a software license, it should be accounted for as a service contract. ASU 2015-05 is effective for reporting periods beginning after December 15, 2015 and may be adopted either retrospectively or prospectively. We are currently evaluating the impact ASU 2015-05 will have on our consolidated financial statements. In April 2015, the FASB issued Accounting Standards Update No. 2015-03, Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"). ASU 2015-03 requires that debt issuance costs related to a recognized liability be presented on the balance sheet as a direct reduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected. ASU 2015-03 is effective for reporting periods beginning after December 15, 2015. The adoption of ASU 2015-03 is not expected to have a material effect our consolidated financial position, results of operations or cash flows. In February 2015, the FASB issued Accounting Standards Update No. 2015-02, Consolidation ("ASU 2015-02"). ASU 2015-02 amends the existing guidance to: (i) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities; (ii) eliminate the presumption that a general partner should consolidate a limited partnership; (iii) affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships and (iv) provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. ASU 2015-02 is effective for reporting periods beginning after December 15, 2015. We are currently evaluating the impact ASU 2015-02 will have on our consolidated financial statements. In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"). ASU 2014-09 supersedes the existing revenue recognition guidance and clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. ASU 2014-09 is effective, on a retrospective basis, for reporting periods beginning after December 15, 2016. Early adoption is permitted, subject to certain conditions. We are currently evaluating the impact ASU 2014-09 will have on our consolidated financial position, results of operations and cash flows.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jul. 01, 2015

The accompanying unaudited condensed consolidated financial statements include the accounts of Shake Shack Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. These interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and on a basis consistent in all material respects with the accounting policies described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014 ("2014 Form 10-K"). In our opinion, all adjustments, which are normal and recurring in nature, necessary for a fair presentation of our financial position and results of operation have been included. Certain reclassifications have been made to prior period amounts to conform to the current year presentation. Operating results for interim periods are not necessarily indicative of the results that may be expected for a full fiscal year.

The accompanying Condensed Consolidated Balance Sheet as of December 31, 2014 has been derived from the audited financial statements at that date but does not include all of the disclosures required by GAAP. These interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes thereto included in our 2014 Form 10-K.

We do not have any components of other comprehensive income recorded within our condensed consolidated financial statements, and, therefore, do not separately present a statement of comprehensive income in our condensed consolidated financial statements.

Fiscal year

We operate on a 52/53 week fiscal year ending on the last Wednesday in December. Fiscal 2015 contains 52 weeks and ends on December 30, 2015. Fiscal 2014 contained 53 weeks and ended on December 31, 2014. Unless otherwise stated, references to years in this report relate to fiscal years.

Use of estimates

The preparation of these condensed consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of sales and expenses during the reporting period. Actual results could differ from those estimates.

Recently issued accounting pronouncements

In July 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update No. 2015-11, Simplifying the Measurement of Inventory ("ASU 2015-11"). Under ASU 2015-11 entities should measure inventory that is not measured using last-in, first-out (LIFO) or the retail inventory method, including inventory that is measured using first-in, first-out (FIFO) or average cost, at the lower of cost or net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. ASU 2015-11 is effective for reporting periods beginning after December 15, 2016 and is to be applied prospectively. The adoption of ASU 2015-11 is not expected to have a material effect on our consolidated financial position, results of operations or cash flows.

In April 2015, the FASB issued Accounting Standards Update No. 2015-05, Customers' Accounting for Fees Paid in a Cloud Computing Arrangement ("ASU 2015-05"). ASU 2015-05 provides guidance in evaluating whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the software license element of the arrangement should be accounted for as an acquisition of a software license. If the arrangement does not contain a software license, it should be accounted for as a service contract. ASU 2015-05 is effective for reporting periods beginning after December 15, 2015 and may be adopted either retrospectively or prospectively. We are currently evaluating the impact ASU 2015-05 will have on our consolidated financial statements.

In April 2015, the FASB issued Accounting Standards Update No. 2015-03, Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"). ASU 2015-03 requires that debt issuance costs related to a recognized liability be presented on the balance sheet as a direct reduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected. ASU 2015-03 is effective for reporting periods beginning after December 15, 2015. The adoption of ASU 2015-03 is not expected to have a material effect our consolidated financial position, results of operations or cash flows.

In February 2015, the FASB issued Accounting Standards Update No. 2015-02, Consolidation ("ASU 2015-02"). ASU 2015-02 amends the existing guidance to: (i) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities; (ii) eliminate the presumption that a general partner should consolidate a limited partnership; (iii) affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships and (iv) provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. ASU 2015-02 is effective for reporting periods beginning after December 15, 2015. We are currently evaluating the impact ASU 2015-02 will have on our consolidated financial statements.

In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"). ASU 2014-09 supersedes the existing revenue recognition guidance and clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. ASU 2014-09 is effective, on a retrospective basis, for reporting periods beginning after December 15, 2016. Early adoption is permitted, subject to certain conditions. We are currently evaluating the impact ASU 2014-09 will have on our consolidated financial position, results of operations and cash flows.