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Description of Business and Basis of Presentation | 12 Months Ended
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Sep. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Description of Business and Basis of Presentation | Description of Business and Basis of Presentation Description of Business We provide a broad range of technical, professional and construction services including engineering, design and architectural services; construction and construction management services; operations and maintenance services; and process, scientific and systems consulting services. We provide our services through offices and subsidiaries located primarily in North America, South America, Europe, the Middle East, India, Australia, Africa and Asia. We provide our services under cost-reimbursable and fixed-price contracts. The percentage of revenues realized from each of these types of contracts for the fiscal years ended September 28, 2018, September 29, 2017 and September 30, 2016 was as follows:
| For the Years Ended
| September 28, 2018 |  | September 29, 2017 |  | September 30, 2016
Cost-reimbursable | 76 | % |  | 81 | % |  | 82 | %
Fixed-price | 24 | % |  | 19 | % |  | 18 | %
Basis of Presentation, Definition of Fiscal Year, and Other Matters The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") and include the accounts of Jacobs Engineering Group Inc. and its subsidiaries and affiliates which it controls. All intercompany accounts and transactions have been eliminated in consolidation. The Company’s fiscal year ends on the Friday closest to September 30 (determined on the basis of the number of workdays) and, accordingly, an additional week of activity is added every five -to- six years. Fiscal 2015 included an extra week of activity. During the second quarter of fiscal 2018, we reorganized our operating and reporting structure around three lines of business (“LOBs”). This reorganization occurred in conjunction with the integration of CH2M into the Company's legacy businesses, and was intended to better serve our global clients, leverage our workforce, help streamline operations and provide enhanced growth opportunities. The three global LOBs are as follows: Aerospace, Technology, Environmental and Nuclear ("ATEN"); Buildings, Infrastructure and Advanced Facilities ("BIAF"); and Energy, Chemicals and Resources ("ECR"). Previously, the Company operated its business around four global lines of businesses. For a further discussion of our segment information, please refer to Note 17- Segment Information.

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- Definition The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -URI http://asc.fasb.org/topic&trid=2122149 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -URI http://asc.fasb.org/topic&trid=2197479 + Details
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