Basis of Presentation (Notes)	9 Months Ended
Oct. 27, 2018
Basis of Presentation [Abstract]
Basis of Accounting	1. Basis of Presentation Dycom Industries, Inc. (“Dycom” or the “Company”) is a leading provider of specialty contracting services throughout the United States. The Company provides program management, engineering, construction, maintenance and installation services for telecommunications providers, underground facility locating services for various utilities, including telecommunications providers, and other construction and maintenance services for electric and gas utilities. The accompanying unaudited condensed consolidated financial statements of the Company and its subsidiaries, all of which are wholly-owned, have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the U.S. Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and notes required by GAAP for annual financial statements and should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in this report and the Company’s audited financial statements included in the Company’s Transition Report on Form 10-K for the six months ended January 27, 2018, filed with the SEC on March 2, 2018. In the opinion of management, all adjustments considered necessary for a fair statement of the results for the interim periods presented have been included. This includes all normal and recurring adjustments and elimination of intercompany accounts and transactions. Operating results for the interim period are not necessarily indicative of the results expected for any subsequent interim or annual period. Accounting Period. In September 2017, the Company’s Board of Directors approved a change in the Company’s fiscal year end from the last Saturday in July to the last Saturday in January. The change in fiscal year end better aligned the Company’s fiscal year with the planning cycles of its customers. For quarterly comparisons, there were no changes to the months in each fiscal quarter. Beginning with fiscal 2019, each fiscal year ends on the last Saturday in January and consists of either 52 or 53 weeks of operations (with the additional week of operations occurring in the fourth fiscal quarter). The Company refers to the period beginning January 28, 2018 and ending January 26, 2019 as “fiscal 2019”, the period beginning July 30, 2017 and ending January 27, 2018 as the “2018 transition period”, and the period beginning July 31, 2016 and ending July 29, 2017 as “fiscal 2017”. Segment Information. The Company operates in one reportable segment. Its services are provided by its operating segments on a decentralized basis. Each operating segment consists of a subsidiary (or in certain instances, the combination of two or more subsidiaries), whose results are regularly reviewed by the Company’s Chief Executive Officer, the chief operating decision maker. All of the Company’s operating segments have been aggregated into one reportable segment based on their similar economic characteristics, nature of services and production processes, type of customers, and service distribution methods.

1. Basis of Presentation

Dycom Industries, Inc. (“Dycom” or the “Company”) is a leading provider of specialty contracting services throughout the United States. The Company provides program management, engineering, construction, maintenance and installation services for telecommunications providers, underground facility locating services for various utilities, including telecommunications providers, and other construction and maintenance services for electric and gas utilities.

The accompanying unaudited condensed consolidated financial statements of the Company and its subsidiaries, all of which are wholly-owned, have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the U.S. Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and notes required by GAAP for annual financial statements and should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in this report and the Company’s audited financial statements included in the Company’s Transition Report on Form 10-K for the six months ended January 27, 2018, filed with the SEC on March 2, 2018. In the opinion of management, all adjustments considered necessary for a fair statement of the results for the interim periods presented have been included. This includes all normal and recurring adjustments and elimination of intercompany accounts and transactions. Operating results for the interim period are not necessarily indicative of the results expected for any subsequent interim or annual period.

Accounting Period. In September 2017, the Company’s Board of Directors approved a change in the Company’s fiscal year end from the last Saturday in July to the last Saturday in January. The change in fiscal year end better aligned the Company’s fiscal year with the planning cycles of its customers. For quarterly comparisons, there were no changes to the months in each fiscal quarter. Beginning with fiscal 2019, each fiscal year ends on the last Saturday in January and consists of either 52 or 53 weeks of operations (with the additional week of operations occurring in the fourth fiscal quarter).

The Company refers to the period beginning January 28, 2018 and ending January 26, 2019 as “fiscal 2019”, the period beginning July 30, 2017 and ending January 27, 2018 as the “2018 transition period”, and the period beginning July 31, 2016 and ending July 29, 2017 as “fiscal 2017”.

Segment Information. The Company operates in one reportable segment. Its services are provided by its operating segments on a decentralized basis. Each operating segment consists of a subsidiary (or in certain instances, the combination of two or more subsidiaries), whose results are regularly reviewed by the Company’s Chief Executive Officer, the chief operating decision maker. All of the Company’s operating segments have been aggregated into one reportable segment based on their similar economic characteristics, nature of services and production processes, type of customers, and service distribution methods.