Shake Shack (SHAK) 10-Q 6 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2015	Oct. 30, 2015
Document Information [Line Items]
Document type	10-Q
Amendment flag	false
Document period end date	Sep. 30, 2015
Document fiscal year focus	2,015
Document fiscal period focus	Q3
Entity registrant name	Shake Shack Inc.
Entity central index key	1,620,533
Current fiscal year end date	--12-30
Entity filer category	Non-accelerated Filer
Entity current reporting status	Yes
Class A Common Stock
Document Information [Line Items]
Entity common stock, shares outstanding		15,213,420
Class B Common Stock
Document Information [Line Items]
Entity common stock, shares outstanding		21,036,580

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets
Cash	$ 69,821	$ 2,677
Accounts receivable	3,135	3,278
Inventories	607	529
Prepaid expenses and other current assets	2,243	1,441
Deferred income taxes	20	20
Total current assets	75,826	7,945
Property and equipment, net	87,977	70,124
Deferred income taxes, net	107,565	141
Other assets	3,414	4,752
TOTAL ASSETS	274,782	82,962
Current liabilities
Short-term borrowings	0	32,000
Accounts payable	5,336	6,440
Accrued expenses	6,471	5,578
Accrued wages and related liabilities	4,752	2,410
Other current liabilities	3,401	1,749
Total current liabilities	19,960	48,177
Notes payable	313	313
Deferred rent	21,317	17,853
Liability under tax receivable agreement	91,311	0
Other long-term liabilities	3,754	4,019
Total liabilities	$ 136,655	$ 70,362
Commitments and contingencies
Stockholders' / members' equity
Members' equity		$ 12,600
Preferred stock, no par value—10,000,000 shares authorized; none issued and outstanding as of September 30, 2015	$ 0
Common stock		0
Additional paid-in capital	129,584
Retained earnings	1,749
Total stockholders' equity attributable to Shake Shack Inc. / members' equity	131,369	12,600
Non-controlling interests	6,758
Total equity	138,127	12,600
TOTAL LIABILITIES AND STOCKHOLDERS' / MEMBERS' EQUITY	274,782	$ 82,962
Class A Common Stock
Stockholders' / members' equity
Common stock	15
Class B Common Stock
Stockholders' / members' equity
Common stock	$ 21

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Preferred Stock, No Par Value	$ 0
Preferred stock, shares authorized	10,000,000
Preferred stock, shares issued	0
Preferred stock, shares outstanding	0
Common stock par value (in usd per share)		$ 0.01
Common stock, shares authorized		100
Common stock, shares, issued		0
Common stock, shares, outstanding		0
Class A Common Stock
Common stock par value (in usd per share)	$ 0.001
Common stock, shares authorized	200,000,000
Common stock, shares, issued	15,213,420
Common stock, shares, outstanding	15,213,420
Class B Common Stock
Common stock par value (in usd per share)	$ 0.001
Common stock, shares authorized	35,000,000
Common stock, shares, issued	21,036,580
Common stock, shares, outstanding	21,036,580

Condensed Consolidated Statemen

Condensed Consolidated Statement of Income (Loss) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 24, 2014	Sep. 30, 2015	Sep. 24, 2014
Shack sales		$ 51,275	$ 30,165	$ 133,905	$ 78,988
Licensing revenue		1,998	1,660	5,626	4,770
TOTAL REVENUE		53,273	31,825	139,531	83,758
Shack-level operating expenses:
Food and paper costs		14,929	9,340	39,650	24,248
Labor and related expenses		12,176	7,668	32,445	20,605
Other operating expenses		4,376	2,905	11,579	7,866
Occupancy and related expenses		4,206	2,675	11,248	6,794
General and administrative expenses		5,728	5,200	30,165	12,192
Depreciation expense		2,636	1,502	7,274	4,067
Pre-opening costs		1,401	1,766	4,054	3,828
Loss on disposal of property and equipment		17	10	17	28
TOTAL EXPENSES		45,469	31,066	136,432	79,628
OPERATING INCOME		7,804	759	3,099	4,130
Interest expense, net		83	128	245	219
INCOME BEFORE INCOME TAXES		7,721	631	2,854	3,911
Income tax expense		1,528	127	2,776	366
NET INCOME		6,193	504	78	3,545
Less: net loss attributable to non-controlling interests		4,665	0	10,100	0
Net income (loss) attributable to Shake Shack Inc.		$ 1,528	$ 504	$ (10,022)	$ 3,545
Earnings per share of Class A common stock
Basic (in USD per share)	[1]	$ 0.11	$ 0.02	$ (0.80)	$ 0.12
Diluted (in USD per share)	[1]	$ 0.10	$ 0.02	$ (0.80)	$ 0.12
Weighted-average shares of Class A common stock outstanding
Basic (shares)	[1]	13,757	29,978	12,590	29,968
Diluted (shares)	[1]	14,785	30,104	12,590	30,119
Pro forma earnings per share of Class A common stock
Basic (in USD per share)	[2]			$ (0.02)
Diluted (in USD per share)	[2]			$ (0.02)
Pro forma
Shack-level operating expenses:
Income tax expense	[2]			$ 1,757
Net income (loss) attributable to Shake Shack Inc.	[2]			$ (295)
[1]	Amounts for the thirteen and thirty-nine weeks ended September 24, 2014 have been retroactively adjusted to give effect to the recapitalization transactions that occurred in connection with our initial public offering, including the amendment and restatement of the limited liability company agreement of SSE Holdings, LLC to, among other things, (i) provide for a new single class of common membership interests and (ii) exchange all of the then-existing members’ ownership interests for the newly-created membership interests. The computation does not consider the 5,750,000 shares of Class A common stock issued to investors in our initial public offering or the 339,306 shares of Class A common stock issued upon settlement of outstanding unit appreciation rights. See Note 12.
[2]	The pro forma financial information presented has been computed to reflect a benefit from income taxes assuming our initial public offering and related organizational transactions occurred on January 1, 2015. See Note 11.

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Income (Loss) (Parenthetical) - Class A Common Stock - Common stock - shares	Feb. 04, 2015	Sep. 30, 2015	Sep. 30, 2015
Shares issued during the period	5,968,841	5,750,000
Issuance of class A common stock in settlement of unit appreciation rights (shares)	339,306	339,306	339,306
IPO
Shares issued during the period	5,750,000

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' and Members' Equity - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Members' Equity	Common stockClass A Common Stock	Common stockClass B Common Stock	Additional Paid-In Capital	Retained Earnings	Non- Controlling Interest
Beginning balance at Dec. 31, 2014	$ 12,600			$ 12,600
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Less: net loss prior to the Organizational Transactions	78
Issuance of class A common stock in settlement of unit appreciation rights (shares)					339,306
Common stock, balance (shares) at Sep. 30, 2015		15,213,420	21,036,580		15,213,420	21,036,580
Ending balance at Sep. 30, 2015	$ 138,127				$ 15	$ 21	$ 129,584	$ 1,749	$ 6,758

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 24, 2014
OPERATING ACTIVITIES
Net income	$ 78	$ 3,545
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation expense	7,274	4,067
Equity-based compensation	15,509	124
Non-cash interest expense	203	75
Loss on disposal of property and equipment	17	28
Changes in operating assets and liabilities:
Accounts receivable	143	(786)
Inventories	(78)	(26)
Prepaid expenses and other current assets	(802)	(38)
Other assets	1,431	(1,120)
Accounts payable	(240)	(204)
Accrued expenses	1,260	2,067
Accrued wages and related liabilities	2,342	(47)
Other current liabilities	421	(70)
Deferred rent	3,717	3,835
Other long-term liabilities	(332)	(17)
NET CASH PROVIDED BY OPERATING ACTIVITIES	30,943	11,433
INVESTING ACTIVITIES
Purchases of property and equipment	(25,327)	(17,885)
NET CASH USED IN INVESTING ACTIVITIES	(25,327)	(17,885)
FINANCING ACTIVITIES
Proceeds from revolving credit facility	4,000	5,000
Payments on revolving credit facility	(36,000)	0
Deferred financing costs	(103)	(298)
Proceeds from issuance of Class A common stock sold in initial public offering, net of underwriting discounts and offering costs	109,362	0
Proceeds from issuance of Class B common stock	30	0
Member distributions	(11,125)	(5,219)
Employee withholding taxes related to net settled equity awards	(4,636)	0
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	61,528	(517)
INCREASE (DECREASE) IN CASH	67,144	(6,969)
CASH AT BEGINNING OF PERIOD	2,677	13,076
CASH AT END OF PERIOD	$ 69,821	$ 6,107

Organization and Nature of Oper

Organization and Nature of Operations	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Nature of Operations	ORGANIZATION AND NATURE OF OPERATIONS Shake Shack Inc. was formed on September 23, 2014 as a Delaware corporation for the purpose of facilitating an initial public offering and other related transactions in order to carry on the business of SSE Holdings, LLC and its subsidiaries. Unless the context otherwise requires, references to " we ," " us ," " our ," " Shake Shack " and the " Company " refer to Shake Shack Inc. and its subsidiaries, including SSE Holdings, LLC, which we refer to as " SSE Holdings ." We operate and license Shake Shack restaurants (" Shacks "), which serve hamburgers, hot dogs, crinkle-cut fries, shakes, frozen custard, beer, wine and more. As of September 30, 2015 , there were 75 Shacks in operation, system-wide, of which 41 were domestic company-operated Shacks, five were domestic licensed Shacks and 29 were international licensed Shacks. Initial Public Offering On February 4, 2015, we completed an initial public offering (" IPO ") of 5,750,000 shares of our Class A common stock at a public offering price of $21.00 per share, which includes 750,000 shares issued pursuant to the underwriters' over-allotment option. We received $112,298 in proceeds, net of underwriting discounts and commissions, which we used to purchase newly-issued membership interests from SSE Holdings at a price per interest equal to the initial public offering price of our Class A common stock. Organizational Transactions In connection with the IPO, we completed the following transactions (the " Organizational Transactions "): ▪ We amended and restated the limited liability company agreement of SSE Holdings (" LLC Agreement ") to, among other things, (i) provide for a new single class of common membership interests in SSE Holdings (" LLC Interests "), (ii) exchange all of the membership interests of the then-existing holders of SSE Holdings' membership interests (" Original SSE Equity Owners ") for LLC Interests and (iii) appoint Shake Shack as the sole managing member of SSE Holdings. See Note 8 . ▪ We amended and restated our certificate of incorporation to, among other things, (i) provide for Class B common stock with voting rights but no economic interests (where "economic interests" means the right to receive any distributions or dividends, whether cash or stock, in connection with common stock) and (ii) issue shares of Class B common stock to the Original SSE Equity Owners on a one -to-one basis with the number of LLC Interests they own. See Note 8 . ▪ We acquired, by merger, two entities that were owned by former indirect members of SSE Holdings (" Former SSE Equity Owners "), for which we issued 5,968,841 shares of Class A common stock as merger consideration (the " Mergers "). The only assets held by the two merged entities prior to the merger were 5,968,841 LLC Interests and a corresponding number of shares of Class B common stock. Upon consummation of the Mergers, we canceled the 5,968,841 shares of Class B common stock and recognized the 5,968,841 of LLC Interests at carrying value, as the Mergers are considered to be transactions between entities under common control. Following the completion of the Organizational Transactions, we owned 33.3% of SSE Holdings. The SSE Holdings members subsequent to the Merger (the " Continuing SSE Equity Owners ") owned the remaining 66.7% of SSE Holdings. As a result of the Organizational Transactions, we became the sole managing member of SSE Holdings and, although we have a minority economic interest in SSE Holdings, we have the sole voting power in, and control the management of, SSE Holdings. Accordingly, we consolidated the financial results of SSE Holdings and reported a non-controlling interest in our condensed consolidated financial statements. As the Organizational Transactions are considered transactions between entities under common control, the financial statements for periods prior to the IPO and Organizational Transactions have been adjusted to combine the previously separate entities for presentation purposes. Secondary Offering In August 2015, we completed a secondary offering of 4,000,000 shares of our Class A common stock at a price of $60.00 per share. All of the shares sold in the offering were offered by affiliates of the Former SSE Equity Owners and certain of the Continuing SSE Equity Owners (the " Selling Stockholders "). We did not receive any proceeds from the sale of shares of Class A common stock offered by the Selling Stockholders. The shares sold in the offering consisted of (i) 844,727 existing shares of Class A common stock held by the Former SSE Equity Owners and (ii) 3,155,273 newly-issued shares of Class A common stock issued in connection with the redemption of 3,155,273 LLC Interests by the Continuing SSE Equity Owners that participated in the offering. Simultaneously, and in connection with the redemption, 3,155,273 shares of Class B common stock were surrendered by the Continuing SSE Equity Owners and canceled. Additionally, in connection with the redemption, we received 3,155,273 newly-issued LLC Interests, increasing our total ownership interest in SSE Holdings. Following the completion of the secondary offering, we own 42.0% of SSE Holdings and the Continuing SSE Equity Owners own the remaining 58.0% of SSE Holdings.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES 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 August 2015, the Financial Accounting Standards Board (" FASB ") issued Accounting Standards Update No. 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements (" ASU 2015-15 "), which clarifies the guidance set forth in Accounting Standards Update No. 2015-03, Simplifying the Presentation of Debt Issuance Costs (" ASU 2015-03 "), issued in April 2015. 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 2015-15 provides additional guidance regarding debt issuance costs associated with line-of-credit arrangements, stating that the SEC staff would not object to an entity deferring and presenting debt issuance costs as an asset and subsequently amortizing the deferred issuance costs ratably over the term of the line-of-credit arrangement. ASU 2015-03 is effective for reporting periods beginning after December 15, 2015. The adoption of ASU 2015-03 and ASU 2015-15 is not expected to have a material effect our consolidated financial position, results of operations or cash flows. In July 2015, the 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 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. In August 2015, the FASB issued an update to ASU 2014-09 deferring the effective date for public entities, on a retrospective basis, to annual reporting periods beginning after December 15, 2017. 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.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS The carrying value of our financial instruments, including cash, accounts receivable, accounts payable, and accrued expenses as of September 30, 2015 and December 31, 2014 approximated their fair value due to the short-term nature of these financial instruments. Assets and liabilities that are measured at fair value on a non-recurring basis include our long-lived assets. There were no impairments recognized during the thirteen and thirty-nine weeks ended September 30, 2015 and September 24, 2014 .

Inventories

Inventories	9 Months Ended
	Sep. 30, 2015
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories as of September 30, 2015 and December 31, 2014 consisted of the following: September 30, December 31, Food $ 396 $ 354 Wine 30 28 Beer 42 33 Beverages 55 42 Retail merchandise 84 72 Inventories $ 607 $ 529

Property and Equipment, Net

Property and Equipment, Net	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	PROPERTY AND EQUIPMENT, NET Property and equipment consisted of the following: September 30, 2015 December 31, 2014 Leasehold improvements $ 76,067 $ 58,272 Equipment 15,667 12,108 Furniture and fixtures 4,427 3,249 Computer equipment and software 4,825 3,529 Construction in progress 7,562 6,309 108,548 83,467 Less: accumulated depreciation (20,571 ) (13,343 ) Property and equipment, net $ 87,977 $ 70,124

Supplemental Balance Sheet Info

Supplemental Balance Sheet Information	9 Months Ended
	Sep. 30, 2015
Supplemental Balance Sheet Disclosures [Abstract]
Supplemental Balance Sheet Information	SUPPLEMENTAL BALANCE SHEET INFORMATION The components of other current liabilities as of September 30, 2015 and December 31, 2014 are as follows: September 30, December 31, Sales tax payable $ 1,117 $ 736 Liability under tax receivable agreement 1,105 — Gift card liability 599 625 Other 580 388 Other current liabilities $ 3,401 $ 1,749

Debt

Debt	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Debt	DEBT In January 2015, we executed a Third Amended and Restated Credit Agreement, which became effective on February 4, 2015 (together with the prior agreements and amendments, the " Revolving Credit Facility "), which provides for a revolving total commitment amount of $50,000 , of which $20,000 is available immediately. The Revolving Credit Facility will mature and all amounts outstanding will be due and payable five years from the effective date. The Revolving Credit Facility permits the issuance of letters of credit upon our request of up to $10,000 . Borrowings under the Revolving Credit Facility bear interest at either: (i) LIBOR plus a percentage ranging from 2.5% to 3.5% or (ii) the prime rate plus a percentage ranging from 0.0% to 1.0% , depending on the type of borrowing made under the Revolving Credit Facility. As of December 31, 2014 , amounts outstanding under the Revolving Credit Facility totaled $32,000 , and were classified as short-term borrowings on the Condensed Consolidated Balance Sheets. During the thirty-nine weeks ended September 30, 2015 , we borrowed an additional $4,000 in principal under the Revolving Credit Facility. In February 2015, we repaid the entire outstanding balance of $36,000 using a portion of the proceeds we received from our IPO and, as of September 30, 2015 , there were no amounts outstanding under the Revolving Credit Facility. We had $19,920 of availability as of September 30, 2015 , after giving effect to $80 in outstanding letters of credit. The Revolving Credit Facility is secured by a first-priority security interest in substantially all of the assets of SSE Holdings and the guarantors. The obligations under the Revolving Credit Facility are guaranteed by each of SSE Holdings' wholly-owned domestic subsidiaries (with certain exceptions). The Revolving Credit Facility contains a number of covenants that, among other things, limit our ability to, subject to specified exceptions, incur additional debt; incur additional liens and contingent liabilities; sell or dispose of assets; merge with or acquire other companies; liquidate or dissolve ourselves; pay dividends or make distributions; engage in businesses that are not in a related line of business; make loans, advances or guarantees; engage in transactions with affiliates; and make investments. In addition, the Revolving Credit Facility contains certain cross-default provisions. We are required to maintain a specified consolidated fixed-charge coverage ratio and a specified funded net debt to adjusted EBITDA ratio, both as defined under the Revolving Credit Facility. As of September 30, 2015 , we were in compliance with all covenants. In March 2013, we entered into a promissory note in the amount of $313 in connection with the purchase of a liquor license. Interest on the outstanding principal balance of this note is due and payable on a monthly basis from the effective date at a rate of 5.0% per year. The entire principal balance and interest is due and payable on the earlier of the maturity date, which is the expiration of the lease in June 2023 , or the date of the sale of the license. As of September 30, 2015 and December 31, 2014 , the outstanding balance of the promissory note was $313 .

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS' EQUITY Amendment and Restatement of Certificate of Incorporation On February 4, 2015, we amended and restated our certificate of incorporation to, among other things, provide for the (i) authorization of 200,000,000 shares of Class A common stock with a par value of $0.001 per share; (ii) authorization of 35,000,000 shares of Class B common stock with a par value of $0.001 per share; (iii) authorization of 10,000,000 shares of undesignated preferred stock that may be issued from time to time by our Board of Directors in one or more series; and (iv) establishment of a classified board of directors, divided into three classes, each of whose members will serve for staggered three -year terms. Holders of our Class A and Class B common stock are entitled to one vote per share and, except as otherwise required, will vote together as a single class on all matters on which stockholders generally are entitled to vote. Holders of our Class B common stock are not entitled to receive dividends and will not be entitled to receive any distributions upon the liquidation, dissolution or winding up of the Company. Shares of Class B common stock may only be issued to the extent necessary to maintain the one -to-one ratio between the number of LLC Interests held by the Continuing SSE Equity Owners and the number of shares of Class B common stock held by the Continuing SSE Equity Owners. Shares of Class B common stock are transferable only together with an equal number of LLC Interests. Shares of Class B common stock will be canceled on a one -for-one basis upon the redemption or exchange any of the outstanding LLC Interests. We must, at all times, maintain a one -to-one ratio between the number of outstanding shares of Class A common stock and the number of LLC Interests owned by us (subject to certain exceptions for treasury shares and shares underlying certain convertible or exchangeable securities). Initial Public Offering As described in Note 1, on February 4, 2015, we completed an initial public offering (" IPO ") of 5,750,000 shares of our Class A common stock at a public offering price of $21.00 per share, which includes 750,000 shares issued pursuant to the underwriters' over-allotment option. We received $112,298 in proceeds, net of underwriting discounts and commissions, which we used to purchase LLC Interests from SSE Holdings at a price per interest equal to the initial public offering price of our Class A common stock. In connection with our IPO, we issued 30,160,694 shares of Class B common stock to the Original SSE Equity Owners. Secondary Offering As described in Note 1, in August 2015, we completed a secondary offering of 4,000,000 shares of our Class A common stock at a price of $60.00 per share. All of the shares sold in the offering were offered by the Selling Stockholders. We did not receive any proceeds from the sale of shares of Class A common stock offered by the Selling Stockholders. The shares sold in the offering consisted of (i) 844,727 existing of existing Class A common stock and (ii) 3,155,273 newly-issued shares of Class A common stock issued in connection with the redemption 3,155,273 LLC Interests. Simultaneously, and in connection with the secondary offering, 3,155,273 shares of Class B common stock were surrendered and canceled. Following the completion of the secondary offering, 15,213,420 shares of Class A common stock and 21,036,580 shares of Class B common stock were outstanding. SSE Holdings Recapitalization As described in Note 1, on February 4, 2015, we amended the SSE Holdings LLC Agreement to, among other things, (i) provide for a new single class of common membership interests in SSE Holdings, the LLC Interests, and (ii) exchange all of the then-existing membership interests of the Original SSE Equity Owners for LLC Interests. The LLC Agreement also provides that holders of LLC Interests may, from time to time, require SSE Holdings to redeem all or a portion of their LLC Interests for newly-issued shares of Class A common stock on a one -for-one basis. Upon receipt of a redemption request, we may, instead, elect to effect a direct exchange of LLC Interests directly with the holder. Additionally, we may elect to settle any such redemption or exchange in shares of Class A common stock or in cash. In the event of cash settlement, we would issue new shares of Class A common stock and use the proceeds from the sale of these newly-issued shares of Class A common stock to fund the cash settlement, which, in effect, limits the amount of the cash payment to the redeeming member. In connection with any redemption or exchange, we will receive a corresponding number of LLC Interests, increasing our total ownership interest in SSE Holdings. Additionally, an equivalent number of shares of Class B common stock will be surrendered and canceled. The amendment also requires that SSE Holdings, at all times, maintain (i) a one -to-one ratio between the number of outstanding shares of Class A common stock and the number of LLC Interests owned by us and (ii) a one -to-one ratio between the number of shares of Class B common stock owned by the Continuing SSE Equity Owners and the number of LLC Interests owned by the Continuing SSE Equity Owners. Member Distributions On December 15, 2014, the Board of Directors of SSE Holdings approved a special distribution to its members, to the extent the gross proceeds from the IPO exceeded the anticipated gross proceeds (including as a result of the exercise by the underwriters of their option to purchase additional shares of Class A common stock), in an amount equal to the product of (i) the increased gross proceeds and (ii) 0.273 , to be paid from the proceeds of the IPO (the " Additional Distribution "). On February 4, 2015, SSE Holdings paid the Additional Distribution to certain of the Original SSE Equity Owners in the amount of $11,125 .

Non-Controlling Interests

Non-Controlling Interests	9 Months Ended
	Sep. 30, 2015
Noncontrolling Interest [Abstract]
Non-Controlling Interests	NON-CONTROLLING INTERESTS On February 4, 2015, we used the net proceeds from our IPO to purchase 5,750,000 newly-issued LLC Interests. Additionally, in connection with the Organizational Transactions, we acquired 5,968,841 LLC Interests. Pursuant to the LLC Agreement, we received 339,306 LLC Interests as a result of the issuance of 339,306 shares of Class A common stock in settlement of the outstanding UARs. In August 2015, in connection with the secondary offering, 3,155,273 LLC Interests were redeemed by the Selling Stockholders for newly-issued shares of Class A common stock and we received 3,155,273 newly-issued LLC Interests, increasing our total ownership interest in SSE Holdings. As of September 30, 2015 , there were 36,250,000 LLC Interests outstanding, of which we owned 15,213,420 LLC Interests, representing a 42.0% ownership interest in SSE Holdings. The following table summarizes the effects of changes in ownership in SSE Holdings on our equity: September 30, 2015 Thirteen Weeks Ended Thirty-Nine Weeks Ended Net income (loss) attributable to Shake Shack Inc. $ 1,528 $ (10,022 ) Transfers to non-controlling interests Decrease in retained earnings as a result of the Organizational Transactions — (1,278 ) Increase in additional paid-in capital as a result of the redemption of LLC Interests 777 777 Change from net income (loss) attributable to Shake Shack Inc. and transfers to non-controlling interest $ 2,305 $ (10,523 )

Equity-Based Compensation

Equity-Based Compensation	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-Based Compensation	EQUITY-BASED COMPENSATION A summary of equity-based compensation expense recognized during the thirteen and thirty-nine weeks ended September 30, 2015 and September 24, 2014 is as follows: Thirteen Weeks Ended Thirty-Nine Weeks Ended September 30, September 24, September 30, September 24, Unit appreciation rights $ — $ — $ 11,762 $ — Restricted Class B units — 41 605 124 Stock options 1,172 — 3,142 — Equity-based compensation expense $ 1,172 $ 41 $ 15,509 $ 124 Amounts are included in general and administrative expense on the Condensed Consolidated Statements of Income (Loss) . No income tax benefits were recognized related to equity-based compensation during the thirteen and thirty-nine weeks ended September 30, 2015 and September 24, 2014 . Unit Appreciation Rights Prior to the IPO, we maintained a Unit Appreciation Rights Plan (the " UAR Plan "), effective in fiscal year 2012, and as amended, whereby we had the authority to grant up to 31,303 unit appreciation rights (" UARs ") to employees. The UARs granted were subject to continued employment and were only exercisable upon a qualifying transaction, which was either a change of control or an initial public offering, each as defined in the UAR Plan. Upon the occurrence of a qualifying transaction, each UAR entitled the holder to receive a payment from us. Such payment and related compensation expense was determined by multiplying (i) the excess, if any, of the qualifying transaction price over the base amount of the UAR, by (ii) the stated number of Class B units deemed covered by the UAR. Effective October 30, 2014, the UAR Plan was amended to provide that the payment to which UAR holders were entitled upon the occurrence of a qualifying transaction would be in the form of securities of the Company or one of its affiliates or such other form of payment as we determined in our sole discretion. The UARs would have terminated on the ten th anniversary of the grant date or upon termination of employment, if earlier. A summary of UAR activity for the thirty-nine weeks ended September 30, 2015 is as follows: UARs Weighted Average Base Price Outstanding at beginning of period 22,554 $ 193.51 Granted — — Forfeited — — Vested and settled (22,554 ) (193.51 ) Outstanding at end of period — $ — No compensation expense was recorded during the thirteen and thirty-nine weeks ended September 24, 2014 related to the outstanding UARs as we determined that, as of the period end, it was not probable that a qualifying transaction would occur. As described in Note 1, on February 4, 2015, we amended and restated the SSE Holdings LLC Agreement to, among other things, (i) provide for a new single class of common membership interests, the LLC Interests, and (ii) exchange all of the then-existing membership interests of the Original SSE Equity Owners for LLC Interests (together, the " Recapitalization Transaction "). The 22,554 o utstanding UARs that were settled in connection with the IPO equate to 767,947 LLC Interests with a weighted average base price of $5.68 , after giving effect to the Recapitalization Transaction. Our IPO constituted a qualifying transaction under the terms of the UAR Plan, resulting in a qualifying transaction price of $715.02 . 339,306 shares of Class A common stock were issued upon the settlement of the 22,554 outstanding UARs, net of employee withholding taxes. We recognized compensation expense of $11,762 during the thirty-nine weeks ended September 30, 2015 upon settlement of the outstanding UARs. Restricted Class B Units Prior to the IPO, we granted restricted Class B units to certain of our executive officers. These awards were to vest in equal installments over periods ranging from three to five years. If not already fully vested, these units would fully vest (i) upon the occurrence of a change in control event or (ii) upon the occurrence of an initial public offering, each as defined in the grant agreement, and any unrecognized compensation expense related to these non-vested units would be subject to acceleration. A summary of restricted Class B unit activity for thirty-nine weeks ended September 30, 2015 is as follows: Units Weighted Average Grant Date Fair Value Outstanding at beginning of period 7,227 $ 92.31 Granted — — Vested (7,227 ) (92.31 ) Forfeited — — Outstanding at end of period — $ — The IPO constituted a transaction under the terms of the restricted Class B unit awards that resulted in the accelerated vesting of all then-outstanding awards, and recognition of the unrecognized compensation expense related to those awards. During the thirty-nine weeks ended September 30, 2015 , we recognized $605 of equity-based compensation expense upon the vesting of these awards. The total fair value of restricted Class B units that vested during the thirty-nine weeks ended September 30, 2015 was $667 . After giving effect to the Recapitalization Transaction, the 7,227 restricted Class B units that vested in connection with our IPO equate to 158,251 LLC Interests with a weighted-average grant date fair value of $4.22 . Stock Options In January 2015, we adopted the 2015 Incentive Award Plan (the " 2015 Plan ") under which we may grant up to 5,865,522 stock options and other equity-based awards to employees, directors and officers. In connection with the IPO, we granted 2,622,281 stock options to our directors and certain employees. The stock options were granted with an exercise price of $21.00 per share and vest equally over periods ranging from one to five years. The fair value of stock option awards was determined on the grant date using the Black-Scholes valuation model based on the following weighted-average assumptions: Thirty-Nine Weeks Ended September 30, 2015 Expected term (years) (1) 7.5 Expected volatility (2) 35.1 % Risk-free interest rate (3) 1.6 % Dividend yield (4) — % (1) Expected term represents the estimated period of time until an award is exercised and was determined using the simplified method. (2) Expected volatility is based on the historical volatility of a selected peer group over a period equivalent to the expected term. (3) The risk-free rate rate is an interpolation of yields on U.S. Treasury securities with maturities equivalent to the expected term. (4) We have assumed a dividend yield of zero as we have no plans to declare dividends in the foreseeable future. A summary of stock option activity for thirty-nine weeks ended September 30, 2015 is as follows: Stock Options Weighted Average Exercise Price Outstanding at beginning of period — $ — Granted 2,622,281 21.00 Exercised — — Forfeited (41,425 ) (21.00 ) Outstanding at end of period 2,580,856 $ 21.00 The weighted-average grant date fair value of stock options granted during the thirty-nine weeks ended September 30, 2015 was $8.53 . As of September 30, 2015 , there were 2,580,856 stock options outstanding, of which none were exercisable. As of September 30, 2015 , total unrecognized compensation expense related to unvested stock options, including an estimate for pre-vesting forfeitures, was $19,109 , which is expected to be recognized over a weighted-average period of 4.3 years.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES As a result of the IPO and Organizational Transactions, we became the sole managing member of SSE Holdings, which is treated as a partnership for U.S. federal and most applicable state and local income tax purposes. As a partnership, SSE Holdings is not subject to U.S. federal and certain state and local income taxes. Any taxable income or loss generated by SSE Holdings is passed through to and included in the taxable income or loss of its members, including us, on a pro rata basis. We are subject to U.S. federal income taxes, in addition to state and local income taxes with respect to our allocable share of any taxable income or loss of SSE Holdings. We are also subject to withholding taxes in foreign jurisdictions. A reconciliation of income tax expense computed at the U.S. federal statutory income tax rate to the income tax expense recognized is as follows: Thirteen Weeks Ended Thirty-Nine Weeks Ended September 30, September 24, September 30, September 24, Income before income taxes $ 7,721 $ 631 $ 2,854 $ 3,911 Less: net loss prior to the Organizational Transactions — — (13,049 ) — Less: net income attributable to non-controlling interests 4,665 — 10,100 — Income attributable to Shake Shack Inc. before income taxes 3,056 631 5,803 3,911 Income taxes at U.S. federal statutory rate 1,070 221 2,031 1,369 State and local income taxes, net of federal benefit 357 48 422 128 Foreign withholding taxes 70 78 214 237 Non-deductible expenses 31 — 109 — LLC flow-through structure — (220 ) — (1,368 ) Income tax expense $ 1,528 $ 127 $ 2,776 $ 366 Pro Forma Financial Information For periods prior to the IPO and Organizational Transactions, our income taxes represent those of SSE Holdings, our predecessor, and relate solely to foreign withholding taxes and certain LLC entity-level taxes. As a result of the IPO and Organizational Transactions that occurred on February 4, 2015, we are subject to U.S. federal and certain state and local income taxes with respect to our allocable share of any taxable income or loss generated by SSE Holdings. The pro forma financial information presented on the Condensed Consolidated Statements of Income (Loss) for the thirty-nine weeks ended September 30, 2015 has been computed to reflect a benefit from income taxes at an effective tax rate of 61.6% . The amounts were calculated assuming the Organizational Transactions occurred on January 1, 2015 and were based on the statutory rates in effect during the period. Tax Receivable Agreement We expect to obtain an increase in our share of the tax basis of our share of the net assets of SSE Holdings when LLC Interests are redeemed or exchanged by the Continuing SSE Equity Owners and other qualifying transactions. This increase in tax basis may have the effect of reducing the amounts that we would otherwise pay in the future to various tax authorities. The increase in tax basis may also decrease gains (or increase losses) on future dispositions of certain capital assets to the extent tax basis is allocated to those capital assets. On February 4, 2015, we entered into a tax receivable agreement with the Continuing SSE Equity Owners (the " Tax Receivable Agreement ") that provides for the payment by us to the Continuing SSE Equity Owners of 85% of the amount of tax benefits, if any, that Shake Shack actually realizes or in some cases are deemed to realize as a result of (i) increases in the tax basis of the net assets of SSE Holdings resulting from any redemptions or exchanges of LLC Interests or any prior sales of interests in SSE Holdings and (ii) certain other tax benefits related to our making payments under the Tax Receivable Agreement. During the thirty-nine weeks ended September 30, 2015 , SSE Holdings paid a distribution in the amount of $11,125 to certain of the Original SSE Equity Owners. This distribution triggered an increase in the tax basis of the net assets of SSE Holdings subject to the provisions of the Tax Receivable Agreement. We recognized a deferred tax asset in the amount of $6,006 and a corresponding liability of $5,105 , representing 85% of the tax benefits due to the Continuing SSE Equity Owners. In August 2015, in connection with the secondary offering, 3,155,273 LLC Interests were redeemed by the Selling Stockholders for newly-issued shares of Class A common stock, resulting in an increase in the tax basis of the net assets of SSE Holdings subject to the provisions of the Tax Receivable Agreement. We recognized a deferred tax asset in the amount of $102,719 and a corresponding liability of $87,311 . As of September 30, 2015 , the total amount due to the Continuing SSE Equity Owners under the Tax Receivable Agreement was $92,416 .

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE Basic earnings per share of Class A common stock is computed by dividing net income available to Shake Shack Inc. by the weighted-average number of shares of Class A common stock outstanding during the period. Diluted earnings per share of Class A common stock is computed by dividing net income available to Shake Shack Inc. by the weighted-average number of shares of Class A common stock outstanding adjusted to give effect to potentially dilutive securities. As described in Note 1, on February 4, 2015, the SSE Holdings LLC Agreement was amended and restated to, among other things, (i) provide for a new single class of common membership interests, the LLC Interests, and (ii) exchange all of the then-existing membership interests of the Original SSE Equity Owners for LLC Interests. For purposes of calculating earnings per share, the prior period amounts have been retroactively adjusted to give effect to the above-mentioned amendment and resulting recapitalization. The computation does not consider the 5,750,000 shares of Class A common stock issued to investors in our IPO or the 339,306 shares of Class A common stock issued upon settlement of outstanding UARs in connection with the IPO. The following table sets forth reconciliations of the numerators and denominators used to compute basic and diluted earnings per share of Class A common stock for the thirteen and thirty-nine weeks ended September 30, 2015 and September 24, 2014 . Thirteen Weeks Ended Thirty-Nine Weeks Ended September 30, September 24, September 30, September 24, Numerator: Net income $ 6,193 $ 504 $ 78 $ 3,545 Less: net income attributable to non-controlling interests 4,665 — 10,100 — Net income (loss) attributable to Shake Shack Inc. $ 1,528 $ 504 $ (10,022 ) $ 3,545 Denominator: Weighted-average shares of Class A common stock outstanding—basic 13,757 29,978 12,590 29,968 Effect of dilutive securities: Restricted Class B units — 126 — 151 Stock options 1,028 — — — Weighted-average shares of Class A common stock outstanding—diluted 14,785 30,104 12,590 30,119 Earnings per share of Class A common stock—basic $ 0.11 $ 0.02 $ (0.80 ) $ 0.12 Earnings per share of Class A common stock—diluted $ 0.10 $ 0.02 $ (0.80 ) $ 0.12 2,580,856 stock options were excluded from the computation of diluted earnings per share of Class A common stock for the thirty-nine weeks ended September 30, 2015 because the effect would have been anti-dilutive as we recorded a net loss for the period. Shares of our Class B common stock do not share in the earnings or losses of Shake Shack and are therefore not participating securities. As such, separate presentation of basic and diluted earnings per share of Class B common stock under the two-class method has not been presented. Shares of our Class B common stock are, however, considered potentially dilutive shares of Class A common stock. After evaluating the potential dilutive effect under the if-converted and two-class methods, the 21,036,580 shares of Class B common stock outstanding as of September 30, 2015 were determined to be anti-dilutive and have therefore been excluded from the computations of diluted earnings per share of Class A common stock.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	9 Months Ended
	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	SUPPLEMENTAL CASH FLOW INFORMATION The following table sets forth supplemental cash flow information for the thirty-nine weeks ended September 30, 2015 and September 24, 2014 : Thirty-Nine Weeks Ended September 30, September 24, Cash paid for: Income taxes, net of refunds $ 338 $ 531 Interest 183 59 Non-cash investing activities: Accrued purchases of property and equipment 3,682 1,304 Class A common stock issued in connection with the acquisition of the Former SSE Equity Owners 6 — Non-cash financing activities: Cancellation of Class B common stock in connection with the Organizational Transactions (6 ) — Class A common stock issued in connection with the redemption of LLC Interests 3 — Cancellation of Class B common stock in connection with the redemption of LLC Interests (3 ) —

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	COMMITMENTS AND CONTINGENCIES Lease Commitments We are obligated under various operating leases for Shacks and our home office space, expiring in various years through 2031. Under certain of these leases, we are liable for contingent rent based on a percentage of sales in excess of a specified threshold and are responsible for our proportionate share of real estate taxes and utilities. As security under the terms of several of our leases, we are obligated under letters of credit totaling $160 as of September 30, 2015 . The letters of credit expire on April 23, 2016 and February 28, 2026. In addition, in December 2013, we entered into an irrevocable standby letter of credit in conjunction with our home office lease in the amount of $80 . The letter of credit expires in September 2016 and renews automatically for one -year periods through September 30, 2019. Purchase Commitments Purchase obligations include legally binding contracts, including commitments for the purchase, construction or remodeling of real estate and facilities, firm minimum commitments for inventory purchases, equipment purchases, marketing-related contracts, software acquisition/license commitments and service contracts. These obligations are generally short-term in nature and are recorded as liabilities when the related goods are received or services rendered. We also enter into long-term, exclusive contracts with certain vendors to supply us with food, beverages and paper goods, obligating us to purchase specified quantities. These volume commitments are not subject to any time limit and there are no material financial penalties associated with these agreements in the event of early termination. Legal Contingencies We are subject to various legal and regulatory proceedings, claims and liabilities, such as employment-related claims and slip and fall cases, which arise in the ordinary course of business and are generally covered by insurance. As of September 30, 2015 , the amount of ultimate liability with respect to these matters was not material.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2015
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS Union Square Hospitality Group Union Square Hospitality Group, LLC is a stockholder and a party to the Stockholders Agreement we entered into in connection with our IPO. The Chairman of our Board of Directors serves as the Chief Executive Officer of Union Square Hospitality Group, LLC. As a result, Union Square Hospitality Group, LLC and its subsidiaries (collectively, " USHG ") are considered related parties. Under the terms of the management agreement with USHG, as amended, in fiscal 2014, we paid a 2.5% management fee to USHG based on Shack sales and licensing revenue generated from license agreements with unaffiliated entities. Total management fees, which are included in general and administrative expenses, amounted to $686 and $1,975 for the thirteen and thirty-nine weeks ended September 24, 2014 , respectively. Effective January 1, 2015, the management agreement was amended and restated. As a result, we are no longer obligated to pay management fees to USHG. Therefore, no management fees were paid to USHG for the thirteen and thirty-nine weeks ended September 30, 2015 . Previously, we sub-leased office space from USHG on a month-to-month basis. Amounts paid to USHG as rent totaled $38 for the thirty-nine weeks ended September 24, 2014 . These amounts are included in general and administrative expense on the Condensed Consolidated Statements of Income (Loss) . No amounts were paid during the thirteen weeks ended September 24, 2014 . Previously, our employees were included in USHG's self-insurance health plan and we paid our portion of the plan costs on a monthly basis to USHG. Amounts paid to the USHG for these health insurance costs were $311 and $913 for the thirteen and thirty-nine weeks ended September 24, 2014 , respectively. In February 2015, we established our own self-funded health insurance plan for our employees and ceased payments to USHG. The total amount paid to USHG for these health insurance costs for the thirty-nine weeks ended September 30, 2015 was $188 . No amounts were paid to USHG for health insurance costs for the thirteen weeks ended September 30, 2015 . These amounts are included in labor and related expenses and general and administrative expenses on the Condensed Consolidated Statements of Income (Loss) . Additionally, our employees are eligible participants under USHG's 401(k) plan. We pay our share of the employer's matching contributions directly to the third-party plan trustee. Total amounts payable to the USHG as of September 30, 2015 and December 31, 2014 were $7 and $238 , respectively, and are included in other current liabilities on the Condensed Consolidated Balance Sheets. Amounts due from USHG for expenses paid by us on behalf of USHG totaled $10 as of September 30, 2015 , which is included in prepaid expenses and other current assets on the Condensed Consolidated Balance Sheets. No amounts were due from USHG as of December 31, 2014 . Hudson Yards Sports and Entertainment In fiscal 2011, we entered into a Master License Agreement (an " MLA ") with Hudson Yards Sports and Entertainment LLC (" HYSE "), a subsidiary of USHG and a related party, to operate Shake Shack branded limited menu concession stands in sports and entertainment venues within the United States. The agreement expires on December 31, 2027 and includes five consecutive five -year renewal options at HYSE's option. As consideration for these rights, HYSE pays us a license fee based on a percentage of net food sales, as defined in the MLA. HYSE also pays us a percentage of profits on sales of branded beverages, as defined in the MLA. Amounts paid to us by HYSE for the thirteen and thirty-nine weeks ended September 30, 2015 were $157 and $252 , respectively, and $122 and $206 for the thirteen and thirty-nine weeks ended September 24, 2014 , respectively. Total amounts due from HYSE as of September 30, 2015 were $63 . No amounts were due from HYSE as of December 31, 2014 due to the seasonal nature of the concession stands. Madison Square Park Conservancy The Chairman of our Board of Directors serves as a director of the Madison Square Park Conservancy (" MSP Conservancy "), with which we have a license agreement and pay license fees to operate our Madison Square Park Shack. Amounts paid to Madison Square Park Conservancy as rent amounted to $331 and $442 for the thirteen and thirty-nine weeks ended September 30, 2015 , respectively, and $204 and $487 for the thirteen and thirty-nine weeks ended September 24, 2014 , respectively. These amounts are included in occupancy and related expenses on the Condensed Consolidated Statements of Income (Loss) . Total amounts due to the MSP Conservancy as of September 30, 2015 were $187 . No amounts were due to the MSP Conservancy as of December 31, 2014 as our Madison Square Park Shack was closed for renovations. Tax Receivable Agreement In connection with our IPO, we entered into a tax receivable agreement with the Continuing SSE Equity Owners that provides for the payment by us to the Continuing SSE Equity Owners of 85% of the amount of tax benefits, if any, that Shake Shack actually realizes or in some cases are deemed to realize as a result of (i) increases in the tax basis of the net assets of SSE Holdings resulting from any redemptions or exchanges of LLC Interests or any prior sales of interests in SSE Holdings and (ii) certain other tax benefits related to our making payments under the Tax Receivable Agreement. See Note 11 for further information. There were no amounts paid to the Continuing SSE Equity Owners during the thirteen and thirty-nine weeks ended September 30, 2015 . Total amounts due to the Continuing SSE Equity Owners as of September 30, 2015 under the tax receivable agreement were $92,416 .

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 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 August 2015, the Financial Accounting Standards Board (" FASB ") issued Accounting Standards Update No. 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements (" ASU 2015-15 "), which clarifies the guidance set forth in Accounting Standards Update No. 2015-03, Simplifying the Presentation of Debt Issuance Costs (" ASU 2015-03 "), issued in April 2015. 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 2015-15 provides additional guidance regarding debt issuance costs associated with line-of-credit arrangements, stating that the SEC staff would not object to an entity deferring and presenting debt issuance costs as an asset and subsequently amortizing the deferred issuance costs ratably over the term of the line-of-credit arrangement. ASU 2015-03 is effective for reporting periods beginning after December 15, 2015. The adoption of ASU 2015-03 and ASU 2015-15 is not expected to have a material effect our consolidated financial position, results of operations or cash flows. In July 2015, the 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 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. In August 2015, the FASB issued an update to ASU 2014-09 deferring the effective date for public entities, on a retrospective basis, to annual reporting periods beginning after December 15, 2017. 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.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2015
Inventory Disclosure [Abstract]
Inventories	Inventories as of September 30, 2015 and December 31, 2014 consisted of the following: September 30, December 31, Food $ 396 $ 354 Wine 30 28 Beer 42 33 Beverages 55 42 Retail merchandise 84 72 Inventories $ 607 $ 529

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property and equipment consisted of the following: September 30, 2015 December 31, 2014 Leasehold improvements $ 76,067 $ 58,272 Equipment 15,667 12,108 Furniture and fixtures 4,427 3,249 Computer equipment and software 4,825 3,529 Construction in progress 7,562 6,309 108,548 83,467 Less: accumulated depreciation (20,571 ) (13,343 ) Property and equipment, net $ 87,977 $ 70,124

Supplemental Balance Sheet In26

Supplemental Balance Sheet Information (Tables)	9 Months Ended
	Sep. 30, 2015
Supplemental Balance Sheet Disclosures [Abstract]
Supplemental Balance Sheet Information	The components of other current liabilities as of September 30, 2015 and December 31, 2014 are as follows: September 30, December 31, Sales tax payable $ 1,117 $ 736 Liability under tax receivable agreement 1,105 — Gift card liability 599 625 Other 580 388 Other current liabilities $ 3,401 $ 1,749

Non-Controlling Interests (Tabl

Non-Controlling Interests (Tables)	9 Months Ended
	Sep. 30, 2015
Noncontrolling Interest [Abstract]
Schedule of non-controlling interest	The following table summarizes the effects of changes in ownership in SSE Holdings on our equity: September 30, 2015 Thirteen Weeks Ended Thirty-Nine Weeks Ended Net income (loss) attributable to Shake Shack Inc. $ 1,528 $ (10,022 ) Transfers to non-controlling interests Decrease in retained earnings as a result of the Organizational Transactions — (1,278 ) Increase in additional paid-in capital as a result of the redemption of LLC Interests 777 777 Change from net income (loss) attributable to Shake Shack Inc. and transfers to non-controlling interest $ 2,305 $ (10,523 )

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of equity-based compensation expense recognized	A summary of equity-based compensation expense recognized during the thirteen and thirty-nine weeks ended September 30, 2015 and September 24, 2014 is as follows: Thirteen Weeks Ended Thirty-Nine Weeks Ended September 30, September 24, September 30, September 24, Unit appreciation rights $ — $ — $ 11,762 $ — Restricted Class B units — 41 605 124 Stock options 1,172 — 3,142 — Equity-based compensation expense $ 1,172 $ 41 $ 15,509 $ 124
Schedule of unit appreciation rights activity	A summary of UAR activity for the thirty-nine weeks ended September 30, 2015 is as follows: UARs Weighted Average Base Price Outstanding at beginning of period 22,554 $ 193.51 Granted — — Forfeited — — Vested and settled (22,554 ) (193.51 ) Outstanding at end of period — $ —
Schedule of restricted class B activity	A summary of restricted Class B unit activity for thirty-nine weeks ended September 30, 2015 is as follows: Units Weighted Average Grant Date Fair Value Outstanding at beginning of period 7,227 $ 92.31 Granted — — Vested (7,227 ) (92.31 ) Forfeited — — Outstanding at end of period — $ —
Schedule of fair value of stock options	The fair value of stock option awards was determined on the grant date using the Black-Scholes valuation model based on the following weighted-average assumptions: Thirty-Nine Weeks Ended September 30, 2015 Expected term (years) (1) 7.5 Expected volatility (2) 35.1 % Risk-free interest rate (3) 1.6 % Dividend yield (4) — % (1) Expected term represents the estimated period of time until an award is exercised and was determined using the simplified method. (2) Expected volatility is based on the historical volatility of a selected peer group over a period equivalent to the expected term. (3) The risk-free rate rate is an interpolation of yields on U.S. Treasury securities with maturities equivalent to the expected term. (4) We have assumed a dividend yield of zero as we have no plans to declare dividends in the foreseeable future.
Schedule of stock options, activity	A summary of stock option activity for thirty-nine weeks ended September 30, 2015 is as follows: Stock Options Weighted Average Exercise Price Outstanding at beginning of period — $ — Granted 2,622,281 21.00 Exercised — — Forfeited (41,425 ) (21.00 ) Outstanding at end of period 2,580,856 $ 21.00

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Reconciliation of income tax expense, US income tax rate	A reconciliation of income tax expense computed at the U.S. federal statutory income tax rate to the income tax expense recognized is as follows: Thirteen Weeks Ended Thirty-Nine Weeks Ended September 30, September 24, September 30, September 24, Income before income taxes $ 7,721 $ 631 $ 2,854 $ 3,911 Less: net loss prior to the Organizational Transactions — — (13,049 ) — Less: net income attributable to non-controlling interests 4,665 — 10,100 — Income attributable to Shake Shack Inc. before income taxes 3,056 631 5,803 3,911 Income taxes at U.S. federal statutory rate 1,070 221 2,031 1,369 State and local income taxes, net of federal benefit 357 48 422 128 Foreign withholding taxes 70 78 214 237 Non-deductible expenses 31 — 109 — LLC flow-through structure — (220 ) — (1,368 ) Income tax expense $ 1,528 $ 127 $ 2,776 $ 366

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Schedule of earnings per share	The following table sets forth reconciliations of the numerators and denominators used to compute basic and diluted earnings per share of Class A common stock for the thirteen and thirty-nine weeks ended September 30, 2015 and September 24, 2014 . Thirteen Weeks Ended Thirty-Nine Weeks Ended September 30, September 24, September 30, September 24, Numerator: Net income $ 6,193 $ 504 $ 78 $ 3,545 Less: net income attributable to non-controlling interests 4,665 — 10,100 — Net income (loss) attributable to Shake Shack Inc. $ 1,528 $ 504 $ (10,022 ) $ 3,545 Denominator: Weighted-average shares of Class A common stock outstanding—basic 13,757 29,978 12,590 29,968 Effect of dilutive securities: Restricted Class B units — 126 — 151 Stock options 1,028 — — — Weighted-average shares of Class A common stock outstanding—diluted 14,785 30,104 12,590 30,119 Earnings per share of Class A common stock—basic $ 0.11 $ 0.02 $ (0.80 ) $ 0.12 Earnings per share of Class A common stock—diluted $ 0.10 $ 0.02 $ (0.80 ) $ 0.12

Supplemental Cash Flow Inform31

Supplemental Cash Flow Information (Tables)	9 Months Ended
	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Schedule of Cash Flow Information	The following table sets forth supplemental cash flow information for the thirty-nine weeks ended September 30, 2015 and September 24, 2014 : Thirty-Nine Weeks Ended September 30, September 24, Cash paid for: Income taxes, net of refunds $ 338 $ 531 Interest 183 59 Non-cash investing activities: Accrued purchases of property and equipment 3,682 1,304 Class A common stock issued in connection with the acquisition of the Former SSE Equity Owners 6 — Non-cash financing activities: Cancellation of Class B common stock in connection with the Organizational Transactions (6 ) — Class A common stock issued in connection with the redemption of LLC Interests 3 — Cancellation of Class B common stock in connection with the redemption of LLC Interests (3 ) —

Organization and Nature of Op32

Organization and Nature of Operations - Franchiser (Details)	Sep. 30, 2015Restaurant
Franchisor Disclosure [Line Items]
Number of restaurants	75
Company-operated | United States
Franchisor Disclosure [Line Items]
Number of restaurants	41
Licensed | United States
Franchisor Disclosure [Line Items]
Number of restaurants	5
Licensed | Non-United States
Franchisor Disclosure [Line Items]
Number of restaurants	29

Organization and Nature of Op33

Organization and Nature of Operations - Initial Public Offering (Details) - Common stock - Class A Common Stock - USD ($) $ / shares in Units, $ in Thousands	Feb. 04, 2015	Sep. 30, 2015
Class of Stock [Line Items]
Shares issued during the period	5,968,841	5,750,000
IPO
Class of Stock [Line Items]
Shares issued during the period	5,750,000
Proceeds of issuance of initial public offering net of underwriting discounts and commissions	$ 112,298
Shares issued, share price (in USD per share)	$ 21
Over-allotment option
Class of Stock [Line Items]
Shares issued during the period	750,000

Organization and Nature of Op34

Organization and Nature of Operations - Organizational Transactions (Details)	Feb. 04, 2015businessshares	Sep. 30, 2015shares
Class of Stock [Line Items]
Number of entities acquired | business	2
Number of LLC interests	5,968,841
Ownership percent of noncontrolling interest	33.30%	42.00%
Noncontrolling owners ownership percentage	66.70%	58.00%
Class A Common Stock
Class of Stock [Line Items]
Ratio of common stock to limited liability company interest	1
Class A Common Stock | Common stock
Class of Stock [Line Items]
Shares issued during the period	5,968,841	5,750,000
Class B Common Stock
Class of Stock [Line Items]
Ratio of common stock to limited liability company interest	1
Class B Common Stock | Common stock
Class of Stock [Line Items]
Shares issued during the period	30,160,694
Shares cancelled during the period	5,968,841

Organization and Nature of Op35

Organization and Nature of Operations - Secondary Offering (Details) - $ / shares	Feb. 04, 2015	Aug. 31, 2015	Sep. 30, 2015	Sep. 30, 2015
Class of Stock [Line Items]
Units acquired during the period	5,968,841
Number of LLC interests				15,213,420
Ownership percent of noncontrolling interest	33.30%		42.00%	42.00%
Noncontrolling owners ownership percentage	66.70%		58.00%	58.00%
Class A Common Stock | Common stock
Class of Stock [Line Items]
Stock issued during period, conversion of units, shares			3,155,273
Common Class B | Common stock
Class of Stock [Line Items]
Stock issued during period, conversion of units, shares			(3,155,273)
Shares cancelled during the period	5,968,841
Secondary offering
Class of Stock [Line Items]
Units acquired during the period		3,155,273
Secondary offering | Class A Common Stock | Common stock
Class of Stock [Line Items]
Total shares offered		4,000,000
Conversion of units from former equity owners		844,727
Stock issued during period, conversion of units, shares		3,155,273
Shares issued, share price (in USD per share)		$ 60
Secondary offering | Common Class B | Common stock
Class of Stock [Line Items]
Shares cancelled during the period		3,155,273
Limited Liability Company | Secondary offering
Class of Stock [Line Items]
Number Of Units Redeemed		3,155,273

Summary of Significant Accoun36

Summary of Significant Accounting Policies (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Fiscal period duration	364 days	371 days

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory [Line Items]
Inventories	$ 607	$ 529
Food
Inventory [Line Items]
Inventories	396	354
Wine
Inventory [Line Items]
Inventories	30	28
Beer
Inventory [Line Items]
Inventories	42	33
Beverages
Inventory [Line Items]
Inventories	55	42
Retail merchandise
Inventory [Line Items]
Inventories	$ 84	$ 72

Property and Equipment, Net (De

Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 108,548	$ 83,467
Less: accumulated depreciation	(20,571)	(13,343)
Property and equipment, net	87,977	70,124
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	76,067	58,272
Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	15,667	12,108
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,427	3,249
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,825	3,529
Construction in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 7,562	$ 6,309

Supplemental Balance Sheet In39

Supplemental Balance Sheet Information - (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Other Liabilities, Current
Sales tax payable	$ 1,117	$ 736
Liability under tax receivable agreement	1,105	0
Gift card liability	599	625
Other	580	388
Other current liabilities	$ 3,401	$ 1,749

Debt (Details)

Debt (Details) - USD ($)	Feb. 04, 2015	Feb. 28, 2015	Sep. 30, 2015	Sep. 24, 2014	Dec. 31, 2014	Mar. 31, 2013
Debt Instrument [Line Items]
Short-term borrowings			$ 0		$ 32,000,000
Proceeds from revolving credit facility			4,000,000	$ 5,000,000
Payments on revolving credit facility			36,000,000	$ 0
Notes payable			313,000		313,000
Notes payable
Debt Instrument [Line Items]
Notes payable face amount						$ 313,000
Stated interest rate						5.00%
Notes payable			$ 313,000		313,000
Letter of credit
Debt Instrument [Line Items]
Term to maturity			1 year
Revolving Credit Facility | Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 50,000,000
Current borrowing capacity	$ 20,000,000
Term to maturity	5 years
Short-term borrowings			$ 0		$ 32,000,000
Proceeds from revolving credit facility			4,000,000
Payments on revolving credit facility		$ 36,000,000
Revolving Credit Facility | Letter of credit | Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 10,000,000
Current borrowing capacity			80,000
Revolving Credit Facility | Revolving credit facility | Line of credit
Debt Instrument [Line Items]
Current borrowing capacity			$ 19,920,000
Revolving Credit Facility | Minimum | Line of credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Revolving Credit Facility | Minimum | Line of credit | Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.00%
Revolving Credit Facility | Maximum | Line of credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	3.50%
Revolving Credit Facility | Maximum | Line of credit | Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%

Stockholders' Equity (Details)

Stockholders' Equity (Details) $ / shares in Units, $ in Thousands	Feb. 04, 2015USD ($)board_of_director_classVote$ / sharesshares	Dec. 15, 2014	Aug. 31, 2015$ / sharesshares	Sep. 30, 2015$ / sharesshares	Sep. 30, 2015USD ($)$ / sharesshares	Sep. 24, 2014USD ($)	Dec. 31, 2014$ / sharesshares
Class of Stock [Line Items]
Common stock, shares authorized							100
Common stock par value (in usd per share) | $ / shares							$ 0.01
Preferred stock, shares authorized	10,000,000			10,000,000	10,000,000
Number of classes of directors | board_of_director_class	3
Board of directors, term	3 years
Number of votes per Share | Vote	1
Common stock, shares, outstanding							0
Member distribution threshold, percentage		27.30%
Member distributions | $	$ 11,125				$ 11,125	$ 5,219
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized	200,000,000			200,000,000	200,000,000
Common stock par value (in usd per share) | $ / shares	$ 0.001			$ 0.001	$ 0.001
Ratio of common stock to limited liability company interest	1
Common stock, shares, outstanding				15,213,420	15,213,420
Class B Common Stock
Class of Stock [Line Items]
Common stock, shares authorized	35,000,000			35,000,000	35,000,000
Common stock par value (in usd per share) | $ / shares	$ 0.001			$ 0.001	$ 0.001
Ratio of common stock to limited liability company interest	1
Common stock, shares, outstanding				21,036,580	21,036,580
IPO
Class of Stock [Line Items]
Member distributions | $					$ 11,125
Common stock | Class A Common Stock
Class of Stock [Line Items]
Shares issued during the period	5,968,841			5,750,000
Stock issued during period, conversion of units, shares				3,155,273
Common stock, shares, outstanding			15,213,420	15,213,420	15,213,420
Common stock | Class B Common Stock
Class of Stock [Line Items]
Shares issued during the period	30,160,694
Stock issued during period, conversion of units, shares				(3,155,273)
Shares cancelled during the period	5,968,841
Common stock, shares, outstanding			21,036,580	21,036,580	21,036,580
Common stock | IPO | Class A Common Stock
Class of Stock [Line Items]
Shares issued during the period	5,750,000
Shares issued, share price (in USD per share) | $ / shares	$ 21
Proceeds of issuance of initial public offering net of underwriting discounts and commissions | $	$ 112,298
Common stock | Over-allotment option | Class A Common Stock
Class of Stock [Line Items]
Shares issued during the period	750,000
Common stock | Secondary offering | Class A Common Stock
Class of Stock [Line Items]
Total conversion of units			4,000,000
Shares issued, share price (in USD per share) | $ / shares			$ 60
Conversion of units from former equity owners			844,727
Stock issued during period, conversion of units, shares			3,155,273
Common stock | Secondary offering | Class B Common Stock
Class of Stock [Line Items]
Shares cancelled during the period			3,155,273
Limited Liability Company | Secondary offering
Class of Stock [Line Items]
Partners' Capital Account, Units, Redeemed			3,155,273

Non-Controlling Interests (Narr

Non-Controlling Interests (Narrative) (Details) - shares	Feb. 04, 2015	Aug. 31, 2015	Sep. 30, 2015	Sep. 30, 2015
Noncontrolling Interest [Line Items]
Units purchased during the period	5,750,000
Units acquired during the period	5,968,841
LLC interests issued for share-based compensation	339,306
Number of LLC interests				15,213,420
Ownership percent of noncontrolling interest	33.30%		42.00%	42.00%
Class A Common Stock | Common stock
Noncontrolling Interest [Line Items]
Issuance of class A common stock in settlement of unit appreciation rights (shares)	339,306		339,306	339,306
Stock issued during period, conversion of units, shares			3,155,273
Secondary offering
Noncontrolling Interest [Line Items]
Units acquired during the period		3,155,273
Secondary offering | Class A Common Stock | Common stock
Noncontrolling Interest [Line Items]
Stock issued during period, conversion of units, shares		3,155,273
Limited Liability Company
Noncontrolling Interest [Line Items]
Partners' Capital Account, Units			36,250,000	36,250,000
Limited Liability Company | Secondary offering
Noncontrolling Interest [Line Items]
Partners' Capital Account, Units, Redeemed		3,155,273

Non-Controlling Interests - Sch

Non-Controlling Interests - Schedule of non-controlling interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 24, 2014	Sep. 30, 2015	Sep. 24, 2014
Noncontrolling Interest [Line Items]
Net income (loss) attributable to Shake Shack Inc.	$ 1,528	$ 504	$ (10,022)	$ 3,545
Change from net income (loss) attributable to Shake Shack Inc. and transfers to non-controlling interest	2,305		(10,523)
IPO
Noncontrolling Interest [Line Items]
(Decrease) in retained earnings and increase in additional paid in capital	0		(1,278)
Secondary offering
Noncontrolling Interest [Line Items]
(Decrease) in retained earnings and increase in additional paid in capital	$ 777		$ 777

Equity-Based Compensation - Sch

Equity-Based Compensation - Schedule of compensation expense recognized (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 24, 2014	Sep. 30, 2015	Sep. 24, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 1,172	$ 41	$ 15,509	$ 124
Unit appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	0	0	11,762	0
Restricted Class B units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	0	41	605	124
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 1,172	$ 0	$ 3,142	$ 0

Equity-Based Compensation (Narr

Equity-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 04, 2015	Feb. 03, 2015	Sep. 30, 2015	Sep. 24, 2014	Sep. 30, 2015	Sep. 30, 2015	Sep. 24, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense			$ 1,172	$ 41		$ 15,509	$ 124
LLC interests
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
IPO qualifying transaction price (in USD per share)						$ 715.02
Unit appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense			0	0		$ 11,762	0
Restricted Class B units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense			0	41		605	124
Fair value of restricted Class B units vested in the period						$ 667
Restricted class B units vested						7,227
Restricted class B units weighted average grant date fair value vested (in USD per share)						$ 92.31
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense			$ 1,172	$ 0		$ 3,142	$ 0
Minimum | Restricted Class B units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Maximum | Restricted Class B units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years
2015 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant			5,865,522		5,865,522	5,865,522
Stock options granted in the period						2,622,281
2015 Incentive Award Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price for stock options granted (in USD per share)						$ 21
2015 Incentive Award Plan | Minimum | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						1 year
2015 Incentive Award Plan | Maximum | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						5 years
Common stock | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of class A common stock in settlement of unit appreciation rights (shares)	339,306				339,306	339,306
Pro forma | LLC interests
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted class B units vested						158,251
Restricted class B units weighted average grant date fair value vested (in USD per share)						$ 4.22
Unit Appreciation Rights Plan | Unit appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant		31,303
Contractual term		10 years
Unit appreciation rights vested and settled						22,554
Weighted average base price of unit appreciation rights vested and settled						$ 193.51
Unit Appreciation Rights Plan | Pro forma | LLC interests
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit appreciation rights vested and settled						767,947
Weighted average base price of unit appreciation rights vested and settled						$ 5.68
2015 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted in the period						2,622,281
Weighted average exercise price for stock options granted (in USD per share)						$ 21
Weighted average grant date fair value of stock options (in USD per share)						$ 8.53
Stock options outstanding			2,580,856		2,580,856	2,580,856		0
Stock options exercisable			0		0	0
Unrecognized compensation expense (USD)			$ 19,109		$ 19,109	$ 19,109
2015 Incentive Award Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period for recognition compensation expense						4 years 4 months

Equity-Based Compensation - S46

Equity-Based Compensation - Schedule of Unit Appreciation Rights (Details) - Unit Appreciation Rights Plan - Unit appreciation rights vested and settled	9 Months Ended
	Sep. 30, 2015$ / sharesshares
UARs
Outstanding at beginning of period | shares	22,554
Granted | shares	0
Forfeited | shares	0
Vested and settled | shares	(22,554)
Outstanding at end of period | shares	0
Weighted Average Base Price
Outstanding at beginning of period (in USD per share)	$ 193.51
Granted (in USD per share)	0
Forfeited (in USD per share)	0
Vested and settled (in USD per share)	(193.51)
Outstanding at end of period (in USD per share)	$ 0

Equity-Based Compensation - S47

Equity-Based Compensation - Schedule of Restricted Class B Stock (Details) - Restricted Class B units	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Units
Outstanding at beginning of period | shares	7,227
Granted | shares	0
Vested | shares	(7,227)
Forfeited | shares	0
Outstanding at beginning of period | shares	0
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in USD per share)	$ 92.31
Granted (in USD per share)	0
Vested (in USD per share)	(92.31)
Forfeited (in USD per share)	0
Outstanding at end of period (in USD per share)	$ 0

Equity-Based Compensation - S48

Equity-Based Compensation - Schedule of Fair Value of Stock Options (Details) - 2015 Incentive Award Plan - Stock options	9 Months Ended
	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	7 years 6 months
Expected volatility	35.10%
Risk-free interest rate	1.60%
Dividend yield	0.00%

Equity-Based Compensation - S49

Equity-Based Compensation - Schedule of Stock Options (Details) - 2015 Incentive Award Plan	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Stock Options
Outstanding at beginning of period | shares	0
Granted | shares	2,622,281
Exercised | shares	0
Forfeited | shares	(41,425)
Outstanding at end of period | shares	2,580,856
Weighted Average Exercise Price
Outstanding at beginning of period (in USD per share)	$ 0
Granted (in USD per share)	21
Exercised (in USD per share)	0
Forfeited (in USD per share)	(21)
Outstanding at end of period (in USD per share)	$ 21

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of income tax expense (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Feb. 03, 2015	Sep. 30, 2015	Sep. 24, 2014	Sep. 30, 2015	Sep. 30, 2015	Sep. 24, 2014
Income Tax Disclosure [Abstract]
Income before income taxes		$ 7,721	$ 631		$ 2,854	$ 3,911
Less: net loss prior to the Organizational Transactions	$ (13,049)	6,193	504	$ 13,127	78	3,545
Less: net loss attributable to non-controlling interests		4,665	0		10,100	0
Income attributable to Shake Shack Inc. before income taxes		3,056	631		5,803	3,911
Income taxes at U.S. federal statutory rate		1,070	221		2,031	1,369
State and local income taxes, net of federal benefit		357	48		422	128
Foreign withholding taxes		70	78		214	237
Non-deductible expenses		31	0		109	0
LLC flow-through structure		0	(220)		0	(1,368)
Income tax expense		$ 1,528	$ 127		$ 2,776	$ 366

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Feb. 04, 2015	Sep. 30, 2015	Sep. 24, 2014	Aug. 31, 2015
Income Tax Contingency [Line Items]
Member distributions	$ 11,125	$ 11,125	$ 5,219
Tax receivable agreement liability		$ 92,416
Number of LLC interests		15,213,420
Pro forma
Income Tax Contingency [Line Items]
Effective income tax rate, percent		61.60%
IPO
Income Tax Contingency [Line Items]
Percentage of tax benefits due to equity owners		85.00%
Member distributions		$ 11,125
Deferred tax asset, tax receivable agreement		6,006
Tax receivable agreement liability		$ 5,105
Secondary offering
Income Tax Contingency [Line Items]
Deferred tax asset, tax receivable agreement				$ 102,719
Tax receivable agreement liability				$ 87,311

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
		Feb. 03, 2015	Sep. 30, 2015	Sep. 24, 2014	Sep. 30, 2015	Sep. 30, 2015	Sep. 24, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less: net loss prior to the Organizational Transactions		$ (13,049)	$ 6,193	$ 504	$ 13,127	$ 78	$ 3,545
Less: net loss attributable to non-controlling interests			4,665	0		10,100	0
Net income (loss) attributable to Shake Shack Inc.			$ 1,528	$ 504		$ (10,022)	$ 3,545
Denominator:
Weighted-average shares of Class A common stock outstanding/weighted-average units outstanding—basic (shares)	[1]		13,757	29,978		12,590	29,968
Effect of dilutive securities:
Weighted-average shares of Class A common stock outstanding/weighted-average units outstanding—diluted (shares)	[1]		14,785	30,104		12,590	30,119
Earnings per share of Class A common stock/earnings per unit—basic (in USD per share)	[1]		$ 0.11	$ 0.02		$ (0.80)	$ 0.12
Earnings per share of Class A common stock/earnings per unit—diluted (in USD per share)	[1]		$ 0.10	$ 0.02		$ (0.80)	$ 0.12
Restricted Stock
Effect of dilutive securities:
Incremental common shares			0	126		0	151
Stock options
Effect of dilutive securities:
Incremental common shares			1,028	0		0	0
[1]	Amounts for the thirteen and thirty-nine weeks ended September 24, 2014 have been retroactively adjusted to give effect to the recapitalization transactions that occurred in connection with our initial public offering, including the amendment and restatement of the limited liability company agreement of SSE Holdings, LLC to, among other things, (i) provide for a new single class of common membership interests and (ii) exchange all of the then-existing members’ ownership interests for the newly-created membership interests. The computation does not consider the 5,750,000 shares of Class A common stock issued to investors in our initial public offering or the 339,306 shares of Class A common stock issued upon settlement of outstanding unit appreciation rights. See Note 12.

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - shares	Feb. 04, 2015	Sep. 30, 2015	Sep. 30, 2015
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares			2,580,856
Class B Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares			21,036,580
Common stock | Class A Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares issued during the period	5,968,841	5,750,000
Issuance of class A common stock in settlement of unit appreciation rights (shares)	339,306	339,306	339,306
IPO | Common stock | Class A Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares issued during the period	5,750,000

Supplemental Cash Flow Inform54

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 24, 2014
Cash paid for:
Income taxes, net of refunds	$ 338	$ 531
Interest	183	59
Non-cash investing activities:
Accrued purchases of property and equipment	3,682	1,304
IPO | Class A Common Stock
Non-cash investing activities:
Class A common stock issued	6	0
IPO | Class B Common Stock
Non-cash financing activities:
Cancellation of Class B common stock	(6)	0
Secondary offering | Class A Common Stock
Non-cash investing activities:
Class A common stock issued	3	0
Secondary offering | Class B Common Stock
Non-cash financing activities:
Cancellation of Class B common stock	$ (3)	$ 0

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2013
Retail site
Loss Contingencies [Line Items]
Letters of credit outstanding	$ 160
Office building
Loss Contingencies [Line Items]
Letters of credit outstanding		$ 80
Letter of credit
Loss Contingencies [Line Items]
Renewal term	1 year

Related Party Transactions (Det

Related Party Transactions (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015USD ($)	Sep. 24, 2014USD ($)	Sep. 30, 2015USD ($)renewal_option	Sep. 24, 2014USD ($)	Dec. 31, 2014USD ($)	Aug. 31, 2015USD ($)
Related Party Transaction [Line Items]
Tax receivable agreement liability	$ 92,416,000		$ 92,416,000
USHG
Related Party Transaction [Line Items]
Management fee					2.50%
Amounts due to related parties	7,000		7,000		$ 238,000
Due from Related Parties, Current	10,000		10,000		0
USHG | Management fee
Related Party Transaction [Line Items]
Expenses from transactions with related party	0	$ 686,000	0	$ 1,975,000
USHG | Rent expense
Related Party Transaction [Line Items]
Expenses from transactions with related party		0		38,000
USHG | Self insurance health care expense
Related Party Transaction [Line Items]
Expenses from transactions with related party	0	311,000	$ 188,000	913,000
Hudson Yards Sports and Entertainment
Related Party Transaction [Line Items]
Number of renewal terms | renewal_option			5
Renewal option period			5 years
Hudson Yards Sports and Entertainment | Concession income
Related Party Transaction [Line Items]
Due from Related Parties, Current	63,000		$ 63,000		0
Revenue from related parties	157,000	122,000	252,000	206,000
Madison Square Park Conservancy | Rent expense
Related Party Transaction [Line Items]
Expenses from transactions with related party	331,000	$ 204,000	442,000	$ 487,000
Due to MSP Conservancy, Current	$ 187,000		$ 187,000		$ 0
IPO
Related Party Transaction [Line Items]
Percentage of tax benefits due to equity owners	85.00%		85.00%
Tax receivable agreement liability	$ 5,105,000		$ 5,105,000
Secondary offering
Related Party Transaction [Line Items]
Tax receivable agreement liability						$ 87,311,000

Uncategorized Items - shak-2015

Label	Element	Value
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation	$ 0
Stockholders' Equity, Change in Reporting Entity	us-gaap_StockholdersEquityChangeInReportingEntity	30
Adjustments to Additional Paid in Capital, Tax Receivable Agreement	shak_AdjustmentstoAdditionalPaidinCapitalTaxReceivableAgreement	16,309
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	3,142
Partners' Capital Account, Distributions	us-gaap_PartnersCapitalAccountDistributions	11,125
Limited Liability Company (LLC) Members' Equity, Unit-based Compensation	us-gaap_LimitedLiabilityCompanyLLCMembersEquityUnitBasedCompensation	7,731
Stock Issued During Period, Value, Conversion of Units	us-gaap_StockIssuedDuringPeriodValueConversionOfUnits	0
Stock Issued During Period, Value, New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	109,362
Additional Paid-in Capital [Member]
Adjustments to Additional Paid in Capital, Tax Receivable Agreement	shak_AdjustmentstoAdditionalPaidinCapitalTaxReceivableAgreement	16,309
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	3,142
Stock Issued During Period, Value, Conversion of Units	us-gaap_StockIssuedDuringPeriodValueConversionOfUnits	777
Stock Issued During Period, Value, New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	109,356
Member Units [Member]
Stockholders' Equity, Change in Reporting Entity	us-gaap_StockholdersEquityChangeInReportingEntity	3,843
Partners' Capital Account, Distributions	us-gaap_PartnersCapitalAccountDistributions	11,125
Limited Liability Company (LLC) Members' Equity, Unit-based Compensation	us-gaap_LimitedLiabilityCompanyLLCMembersEquityUnitBasedCompensation	7,731
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	us-gaap_ProfitLoss	(13,049)
Noncontrolling Interest [Member]
Stockholders' Equity, Change in Reporting Entity	us-gaap_StockholdersEquityChangeInReportingEntity	(2,565)
Stock Issued During Period, Value, Conversion of Units	us-gaap_StockIssuedDuringPeriodValueConversionOfUnits	(777)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	us-gaap_ProfitLoss	10,100
Retained Earnings [Member]
Stockholders' Equity, Change in Reporting Entity	us-gaap_StockholdersEquityChangeInReportingEntity	$ (1,278)
Stock Issued During Period, Value, Conversion of Units	us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	us-gaap_ProfitLoss	$ 3,027
Common Class A [Member] | Common Stock [Member]
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation	0
Stockholders' Equity, Change in Reporting Entity	us-gaap_StockholdersEquityChangeInReportingEntity	$ 6
Stockholders Equity, Change in Reporting Entity, Shares	shak_StockholdersEquityChangeinReportingEntityShares	5,968,841
Stock Issued During Period, Value, Conversion of Units	us-gaap_StockIssuedDuringPeriodValueConversionOfUnits	$ 3
Stock Issued During Period, Value, New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	6
Common Class B [Member] | Common Stock [Member]
Stockholders' Equity, Change in Reporting Entity	us-gaap_StockholdersEquityChangeInReportingEntity	$ 24
Stockholders Equity, Change in Reporting Entity, Shares	shak_StockholdersEquityChangeinReportingEntityShares	24,191,853
Stock Issued During Period, Value, Conversion of Units	us-gaap_StockIssuedDuringPeriodValueConversionOfUnits	$ (3)