Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Oct. 01, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The information as of October 1, 2017 and for the three and nine months ended October 1, 2017 and September 25, 2016 is unaudited. The condensed consolidated balance sheet as of December 25, 2016 was derived from the Company’s audited consolidated financial statements at that date. In the opinion of management, these unaudited condensed consolidated financial statements include all adjustments, consisting of normal recurring adjustments necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the interim periods presented. The results have been prepared in accordance with the instructions to Form 10-Q and do not necessarily include all information and footnotes necessary for presentation in accordance with accounting principles generally accepted in the U.S. (“GAAP”). These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the related notes included in the Company’s audited annual consolidated financial statements for the fiscal year ended December 25, 2016, included in the Company’s Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission on February 27, 2017 (the “Form 10-K”). Interim operating results are not necessarily indicative of operating results expected in subsequent periods or for the year as a whole.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its 100% owned subsidiaries for which all inter-company transactions have been eliminated in consolidation.
Fiscal Year	Fiscal Year The Company has a 52/53 week fiscal year ending on the last Sunday of the calendar year, with interim fiscal periods ending on the last Sunday of each calendar quarter. The three and nine month periods ended October 1, 2017 and September 25, 2016 consisted of 14-week and 13-week periods and 40-week and 39-week periods, respectively. There are 53 calendar weeks in the fiscal year ending on December 31, 2017 and 52 calendar weeks in the fiscal year ended on December 25, 2016.
Accounting Estimates	Accounting Estimates There have been no significant changes in the Company’s accounting estimates for the three and nine months ended October 1, 2017 as compared to the accounting estimates described in the Form 10-K.
Accounting Standards Updates	Accounting Standards Updates In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-09 (“ASU 2017-09”), Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting. ASU 2017-09 was issued to provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The amendments in this ASU are effective for annual periods beginning after December 15, 2017. The Company does not expect that the standard will have a material effect on its consolidated financial statements and will apply this guidance to applicable transactions after the adoption date. In January 2017, the FASB issued ASU 2017-04 (“ASU 2017-04”), Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. ASU 2017-04 amends the guidance to simplify the subsequent measurement of goodwill by removing Step 2 of the goodwill impairment test. Instead, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value. ASU 2017-04 is effective for annual reporting periods beginning after December 15, 2019, with early adoption permitted. The Company is currently evaluating the impact of the new guidance and timing of adoption, but does not expect that the standard will have a material impact on its consolidated financial statements. In October 2016, the FASB issued ASU 2016-16 (“ASU 2016-16”), Income Taxes (Topic 740), Intra-Entity Transfers of Assets Other Than Inventory. ASU 2016-16 requires that entities recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, rather than when the asset is sold to an outside party. ASU 2016-16 is effective for annual reporting periods beginning after December 15, 2017, including interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period (as of the first interim period if an entity issues interim financial statements). ASU 2016-16 requires adoption on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company early adopted this standard on December 26, 2016. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In August 2016, the FASB issued ASU 2016-15 (“ASU 2016-15”), Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The objective of ASU 2016-15 is to reduce existing diversity in practice by addressing eight specific cash flow issues related to how certain cash receipts and cash payments are presented and classified in the statement of cash flows. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. If early adopted, an entity must adopt all of the amendments in the same period. The Company does not believe that the adoption of this guidance will have a material impact on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02 (“ASU 2016-02”), Leases. ASU 2016-02 requires that lessees recognize assets and liabilities for the rights and obligations underlying leases with a lease term of more than one year. The amendments in this ASU are effective for annual periods beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of ASU 2016-02 on its consolidated financial statements. In May 2014, the FASB issued ASU 2014-09 (“ASU 2014-09”), Revenue from Contracts with Customers. ASU 2014-09 establishes a broad principle that would require an entity to 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 or services. The FASB has also issued several updates to ASU 2014-09. The new standard supersedes GAAP guidance on revenue recognition and requires the use of more estimates and judgments than the present standards. It also requires additional disclosures. ASU 2014-09 may be applied either retrospectively or through the use of a modified-retrospective method. The full retrospective method requires companies to recast each prior reporting period presented as if the new guidance had always existed. Under the modified retrospective method, companies would recognize the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings at the date of initial application. The Company plans to adopt the new revenue standard effective January 1, 2018, through the use of the modified-retrospective method. The Company commenced a detailed analysis of the impact of ASU 2014-09 in 2016, by evaluating its impact on selected contracts at each of the Company’s business segments. With this baseline understanding, the Company developed a project plan to evaluate the contracts across all the business segments, spent significant effort in education of both management and other employees on the effects of the new guidance and assessed the internal control structure in order to adopt the ASU on January 1, 2018. ASU 2014-09 also requires expanded disclosure regarding the nature, timing, and uncertainty of revenue, cash flow and customer contract balances, including how and when performance obligations are satisfied and the relationship between revenue recognized and changes in contract balances during a reporting period. The Company has evaluated these disclosure requirements and is incorporating the collection of relevant data into its quarterly processes. The Company also designed and implemented specific controls based on the evaluation of the impact of ASU 2014-09, including the calculation of the cumulative effect of adopting ASU 2014-09. Although the Company does not expect significant changes to its accounting systems or controls upon adoption of ASU 2014-09, it has modified certain of its current controls to incorporate the revisions that it has made to its accounting policies and practices. The Company’s management has periodically briefed the Audit Committee on progress made towards adoption. Based upon an assessment of material active contracts, the Company does not expect the impact on the results of operations or cash flows upon adoption or in the periods after adoption to be material. Under ASU 2014-09, revenue is recognized as control transfers to the customer. As such, revenue for the Company’s contracts will generally be recognized over time using the cost-to-cost method, which is consistent with the revenue recognition model currently in use for the majority of contracts. For those contracts where revenue is currently recognized as units are delivered, in most cases the accounting for those contracts will change under ASU 2014-09 such that revenue will be recognized as costs are incurred. This change will generally result in an acceleration of revenue as compared with the current revenue recognition method for those contracts. The Company expects the cumulative effect of adopting ASU 2014-09 to result in an increase in revenue of less than $3 million and an increase in operating income of less than $2 million. These changes principally reflect the impact of converting contracts currently applying the units-of-delivery method to the cost-to-cost method of accounting. The Company will adopt the new revenue guidance effective January 1, 2018, by recognizing the cumulative effect of adoption as an increase in unbilled accounts receivable, a reduction in inventoried costs, an increase in advance payments and amounts in excess of costs incurred and a net decrease in accumulated deficit as of January 1, 2018. The Company will continue the evaluation of ASU 2014-09 (including how it may impact new contracts received as well as new or emerging interpretations of the standard) through the date of adoption.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying amounts and the related estimated fair values of the Company’s long-term debt financial instruments not measured at fair value on a recurring basis at October 1, 2017 and December 25, 2016 are presented in Note 7. The carrying value of all other financial instruments, including cash equivalents, accounts receivable, accounts payable, accrued expenses, billings in excess of cost and earnings on uncompleted contracts, income taxes payable and short-term debt, approximated their estimated fair values at October 1, 2017 and December 25, 2016 due to the short-term nature of these instruments.
Net Loss Per Common Share	Net Loss Per Common Share The Company calculates net loss per share in accordance with FASB Accounting Standards Codification Topic 260, Earnings per Share (“Topic 260”). Under Topic 260, basic net loss per common share is calculated by dividing net loss by the weighted-average number of common shares outstanding during the reporting period. Diluted net loss per common share reflects the effects of potentially dilutive securities.