Commitment and Contingencies	9 Months Ended
Oct. 27, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies On October 25, 2018 and October 30, 2018, the Company, its Chief Executive Officer and its Chief Financial Officer were named as defendants in two substantively identical lawsuits alleging violations of the federal securities fraud laws. The lawsuits, which purport to be brought on behalf of a class of all purchasers of the Company’s securities between November 20, 2017 and August 10, 2018, were filed in the United States District Court for the Southern District of Florida. The Company anticipates that these cases and any similar cases filed in the future will be consolidated into a single action. The lawsuits allege that the defendants made materially false and misleading statements or failed to disclose material facts regarding the Company’s financial condition and business operations, including those related to the Company’s dependency on, and uncertainties related to, the permitting necessary for its large projects which, according to the plaintiffs, had the effect of artificially inflating the price of the Company’s common stock. The plaintiffs seek unspecified damages. The Company believes the allegations in the lawsuits are without merit and intends to vigorously defend the lawsuits. Based on the very early stage of this matter, it is not possible to estimate the amount or range of possible loss that might result from an adverse judgment or a settlement of these matters. During the fourth quarter of fiscal 2016, one of the Company’s subsidiaries ceased operations. This subsidiary contributed to a multiemployer pension plan, the Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Fund (the “Plan”). In October 2016, the Plan demanded payment for a claimed withdrawal liability of approximately $13.0 million. In December 2016, the Company submitted a formal request to the Plan seeking review of the Plan’s withdrawal liability determination. The Company is disputing the claim of a withdrawal liability demanded by the Plan as it believes there is a statutory exemption available under the Employee Retirement Income Security Act (“ERISA”) for multiemployer pension plans that primarily cover employees in the building and construction industry. The Plan has taken the position that the work at issue does not qualify for the statutory exemption. The Company has submitted this dispute to arbitration, as required by ERISA, with a hearing expected sometime in the first half of calendar 2019. There can be no assurance that the Company will be successful in asserting the statutory exemption as a defense in the arbitration proceeding. As required by ERISA, in November 2016, the subsidiary began making monthly payments of a withdrawal liability to the Plan in the amount of approximately $0.1 million. If the Company prevails in disputing the withdrawal liability, all such payments will be refunded to the subsidiary. With respect to the acquisition of certain assets and the assumption of certain liabilities associated with the wireless network deployment and wireline operations of Goodman Networks Incorporated (“Goodman”) during fiscal 2016, $22.5 million of the purchase price was placed into escrow to cover indemnification claims and working capital adjustments. During fiscal 2017, $2.5 million of escrowed funds were released following resolution of closing working capital and $10.0 million of escrowed funds were released as a result of Goodman’s resolution of a sales tax liability with the State of Texas. In April 2018, $9.7 million of escrowed funds were released in connection with the resolution of certain indemnification claims, of which Dycom received $1.6 million. There was no impact on the Company’s results of operations related to the escrow release. As of October 27, 2018, approximately $0.3 million remains in escrow pending resolution of certain post-closing indemnification claims. From time to time, the Company is party to various claims and legal proceedings arising in the ordinary course of business. While the resolution of these matters cannot be predicted with certainty, it is the opinion of management, based on information available at this time, that the outcome of any such claims or proceedings will not have a material effect on the Company’s financial statements. For claims within its insurance program, the Company retains the risk of loss, up to certain limits, for matters related to automobile liability, general liability (including damages associated with underground facility locating services), workers’ compensation, and employee group health. The Company has established reserves that it believes to be adequate based on current evaluations and experience with these types of claims. For these claims, the effect on the Company’s financial statements is generally limited to the amount needed to satisfy insurance deductibles or retentions. Commitments Performance and Payment Bonds and Guarantees. The Company has obligations under performance and other surety contract bonds related to certain of its customer contracts. Performance bonds generally provide a customer with the right to obtain payment and/or performance from the issuer of the bond if the Company fails to perform its contractual obligations. As of October 27, 2018 and January 27, 2018, the Company had $118.8 million and $118.1 million, respectively, of outstanding performance and other surety contract bonds. As part of its insurance program, the Company provides surety bonds to support obligations to its insurance carriers. As of October 27, 2018 and January 27, 2018, the Company had $22.1 million and $21.9 million, respectively, of outstanding surety bonds related to its insurance obligations. Additionally, the Company periodically guarantees certain obligations of its subsidiaries, including obligations in connection with obtaining state contractor licenses and leasing real property and equipment. Letters of Credit. The Company has standby letters of credit issued under its Credit Agreement as part of its insurance program. These standby letters of credit collateralize obligations to the Company’s insurance carriers in connection with the settlement of potential claims. In connection with these collateral obligations, the Company had $48.6 million of outstanding standby letters of credit issued under the Credit Agreement as of both October 27, 2018 and January 27, 2018.

Commitments and Contingencies

On October 25, 2018 and October 30, 2018, the Company, its Chief Executive Officer and its Chief Financial Officer were named as defendants in two substantively identical lawsuits alleging violations of the federal securities fraud laws. The lawsuits, which purport to be brought on behalf of a class of all purchasers of the Company’s securities between November 20, 2017 and August 10, 2018, were filed in the United States District Court for the Southern District of Florida. The Company anticipates that these cases and any similar cases filed in the future will be consolidated into a single action. The lawsuits allege that the defendants made materially false and misleading statements or failed to disclose material facts regarding the Company’s financial condition and business operations, including those related to the Company’s dependency on, and uncertainties related to, the permitting necessary for its large projects which, according to the plaintiffs, had the effect of artificially inflating the price of the Company’s common stock. The plaintiffs seek unspecified damages. The Company believes the allegations in the lawsuits are without merit and intends to vigorously defend the lawsuits. Based on the very early stage of this matter, it is not possible to estimate the amount or range of possible loss that might result from an adverse judgment or a settlement of these matters.

During the fourth quarter of fiscal 2016, one of the Company’s subsidiaries ceased operations. This subsidiary contributed to a multiemployer pension plan, the Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Fund (the “Plan”). In October 2016, the Plan demanded payment for a claimed withdrawal liability of approximately $13.0 million. In December 2016, the Company submitted a formal request to the Plan seeking review of the Plan’s withdrawal liability determination. The Company is disputing the claim of a withdrawal liability demanded by the Plan as it believes there is a statutory exemption available under the Employee Retirement Income Security Act (“ERISA”) for multiemployer pension plans that primarily cover employees in the building and construction industry. The Plan has taken the position that the work at issue does not qualify for the statutory exemption. The Company has submitted this dispute to arbitration, as required by ERISA, with a hearing expected sometime in the first half of calendar 2019. There can be no assurance that the Company will be successful in asserting the statutory exemption as a defense in the arbitration proceeding. As required by ERISA, in November 2016, the subsidiary began making monthly payments of a withdrawal liability to the Plan in the amount of approximately $0.1 million. If the Company prevails in disputing the withdrawal liability, all such payments will be refunded to the subsidiary.

With respect to the acquisition of certain assets and the assumption of certain liabilities associated with the wireless network deployment and wireline operations of Goodman Networks Incorporated (“Goodman”) during fiscal 2016, $22.5 million of the purchase price was placed into escrow to cover indemnification claims and working capital adjustments. During fiscal 2017, $2.5 million of escrowed funds were released following resolution of closing working capital and $10.0 million of escrowed funds were released as a result of Goodman’s resolution of a sales tax liability with the State of Texas. In April 2018, $9.7 million of escrowed funds were released in connection with the resolution of certain indemnification claims, of which Dycom received $1.6 million. There was no impact on the Company’s results of operations related to the escrow release. As of October 27, 2018, approximately $0.3 million remains in escrow pending resolution of certain post-closing indemnification claims.

From time to time, the Company is party to various claims and legal proceedings arising in the ordinary course of business. While the resolution of these matters cannot be predicted with certainty, it is the opinion of management, based on information available at this time, that the outcome of any such claims or proceedings will not have a material effect on the Company’s financial statements.

For claims within its insurance program, the Company retains the risk of loss, up to certain limits, for matters related to automobile liability, general liability (including damages associated with underground facility locating services), workers’ compensation, and employee group health. The Company has established reserves that it believes to be adequate based on current evaluations and experience with these types of claims. For these claims, the effect on the Company’s financial statements is generally limited to the amount needed to satisfy insurance deductibles or retentions.

Commitments

Performance and Payment Bonds and Guarantees. The Company has obligations under performance and other surety contract bonds related to certain of its customer contracts. Performance bonds generally provide a customer with the right to obtain payment and/or performance from the issuer of the bond if the Company fails to perform its contractual obligations. As of October 27, 2018 and January 27, 2018, the Company had $118.8 million and $118.1 million, respectively, of outstanding performance and other surety contract bonds. As part of its insurance program, the Company provides surety bonds to support obligations to its insurance carriers. As of October 27, 2018 and January 27, 2018, the Company had $22.1 million and $21.9 million, respectively, of outstanding surety bonds related to its insurance obligations. Additionally, the Company periodically guarantees certain obligations of its subsidiaries, including obligations in connection with obtaining state contractor licenses and leasing real property and equipment.

Letters of Credit. The Company has standby letters of credit issued under its Credit Agreement as part of its insurance program. These standby letters of credit collateralize obligations to the Company’s insurance carriers in connection with the settlement of potential claims. In connection with these collateral obligations, the Company had $48.6 million of outstanding standby letters of credit issued under the Credit Agreement as of both October 27, 2018 and January 27, 2018.