Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Dec. 29, 2017
Basis Of Presentation [Abstract]
Use of Estimates and Assumptions	Use of Estimates and Assumptions The preparation of financial statements in conformity with U.S. GAAP requires us to employ estimates and make assumptions that affect the reported amounts of certain assets and liabilities, the revenues and expenses reported for the periods covered by the accompanying consolidated financial statements, and certain amounts disclosed in these Notes to the Consolidated Financial Statements. Although such estimates and assumptions are based on management’s most recent assessment of the underlying facts and circumstances utilizing the most current information available and past experience, actual results could differ significantly from those estimates and assumptions. Our estimates, judgments, and assumptions are evaluated periodically and adjusted accordingly. Please refer to Note 2 Significant Accounting Policies of Notes to Consolidated Financial Statements included in our 2017 Form 10-K for a discussion of the significant estimates and assumptions affecting our consolidated financial statements.
Fair Value and Fair Value Measurements	Fair Value and Fair Value Measurements Certain amounts included in the accompanying consolidated financial statements are presented at “fair value.” Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants as of the date fair value is determined (the “measurement date”). When determining fair value, we consider the principal or most advantageous market in which we would transact, and we consider only those assumptions we believe a typical market participant would consider when pricing an asset or liability. In measuring fair value, we use the following inputs in the order of priority indicated: Level 1 - Quoted prices in active markets for identical assets or liabilities. Level 2 - Observable inputs other than quoted prices in active markets included in Level 1, such as (i) quoted prices for similar assets or liabilities; (ii) quoted prices in markets that have insufficient volume or infrequent transactions (e.g., less active markets); and (iii) model-driven valuations in which all significant inputs are observable or can be derived principally from, or corroborated with, observable market data for substantially the full term of the asset or liability. Level 3 - Unobservable inputs to the valuation methodology that are significant to the fair value measurement. Please refer to Note 2 Significant Accounting Policies of Notes to Consolidated Financial Statements included in our 2017 Form 10-K for a more complete discussion of the various items within the consolidated financial statements measured at fair value and the methods used to determine fair value. The net carrying amounts of cash and cash equivalents, trade receivables and payables, and notes payable approximate Fair Value due to the short-term nature of these instruments. Similarly, we believe the carrying value of long-term debt also approximates Fair Value based on the interest rates and scheduled maturities applicable to the outstanding borrowings.
New Accounting Pronouncements	Revenue Recognition From time to time, the Financial Accounting Standards Board (“FASB”) issues accounting standards updates (each being an “ASU”) to its Accounting Standards Codification (“ASC”), which constitutes the primary source of U.S. GAAP. The Company regularly monitors ASUs as they are issued and considers their applicability to its business. All ASUs applicable to the Company are adopted by the due date and in the manner prescribed by the FASB. In May 2014, the FASB issued ASU No. 2014-09 Revenue from Contracts with Customers. The new guidance provided by ASU 2014-09 is intended to remove inconsistencies and perceived weaknesses in the existing revenue requirements, provide a more robust framework for addressing revenue issues, improve comparability, provide more useful information and simplify the preparation of financial statements. ASU 2014-09 was initially effective for annual and interim reporting periods beginning after December 15, 2016. On July 9, 2015, the FASB approved a one-year deferral of the effective date of this standard. The revised effective date for the standard is for annual reporting periods beginning after December 15, 2017 and interim periods therein. The FASB also approved changes allowing for early adoption of the standard as of the original effective date. The Company’s adoption activities will be performed over three phases: (i) assessment, (ii) design, and (iii) implementation. Our assessment phase is complete. We have established a cross-functional team to implement ASU 2014-09. We have identified and are in the process of implementing changes to our systems, processes and internal controls to meet the standard’s updated reporting and disclosure requirements. The following are the potential significant differences identified during the assessment phase: Performance Obligations Under current U.S. GAAP, the Company typically considers engineering and construction services as separate performance obligations. Under ASU 2014-09, the Company has determined, in most instances, it is likely that engineering and construction services will be required to be combined into a single performance obligation. In these instances, this will likely change the timing and pattern of revenue recognition. Contract Modifications In many instances, the Company enters into contracts for construction services subsequent to entering in to engineering services contracts (“Phased Projects”). Under ASU 2014-09, the construction services contract may be deemed to modify the engineering contract, or may be required to be combined with the engineering contract. This modification or combination of contracts may result in a cumulative catchup adjustment, which will have an immediate impact on the Company’s results of operations in the period the contract combination or modification occurs. In addition, it will change the timing and pattern of revenue recognition after the period the contracts have been combined or modified. The Company analyzed its current Phased Projects and concluded that a significant number of these arrangements would be combined under ASU 2014-09. The Company currently intends to adopt the new standard using the Modified Retrospective application. This standard could have a significant impact on the Company’s Consolidated Financial Statements and an administrative impact on its operations and will depend on the magnitude of the items discussed above. The Company will continue to evaluate the impact through the design and implementation phases. Lease Accounting In February 2016, the FASB issued ASU 2016-02 Leases. ASU 2016-02 requires lessees to recognize assets and liabilities for most leases. ASU 2016-02 is effective for public entity financial statements for annual periods beginning after December 15, 2018, and interim periods within those annual periods. Early adoption is permitted, including adoption in an interim period. The guidance must be adopted using a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. The Company is evaluating the impact of the new guidance on its consolidated financial statements. This standard could have a significant administrative impact on its operations, and the Company will further assess the impact through its implementation program. Hedge Accounting In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. ASU No. 2017-12 makes targeted improvements to the current guidance on accounting for hedges so that it provides a better view of an entity’s risk management activities and how the entity’s hedging strategies are being used to manage risk. In addition, ASU No. 2017-12 further simplifies the application of certain aspects of hedge accounting, including the measurement of hedge effectiveness. The revised guidance becomes effective for fiscal years beginning after December 15, 2018. The Company is evaluating the impact of the new guidance on its consolidated financial statements. It is not expected that the updated guidance will have a significant impact on the Company’s consolidated financial statements.