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Cover - USD ($)
 12 Months Ended
Jan. 30, 2021
Mar. 01, 2021
Jul. 25, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jan. 30, 2021    
Current Fiscal Year End Date --01-30    
Document Transition Report false    
Entity File Number 001-10613    
Entity Registrant Name DYCOM INDUSTRIES, INC.    
Entity Tax Identification Number 59-1277135    
Entity Incorporation, State FL    
Entity Address, Street 11780 US Highway 1, Suite 600    
Entity Address, City Palm Beach Gardens,    
Entity Address, State FL    
Entity Address, Postal Zip Code 33408    
City Area Code 561    
Local Phone Number 627-7171    
Title of Each Class Common stock, par value $0.33 1/3 per share    
Trading Symbol(s) DY    
Name of Each Exchange on Which Registered NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1,263,970,579
Documents Incorporated by Reference [Text Block]
DocumentPart of Annual Report on Form 10-K into which incorporated
Portions of the registrant’s Proxy Statement for its 2021 Annual Meeting of ShareholdersParts II and III
Such Proxy Statement, except for the portions thereof which have been specifically incorporated by reference, shall not be deemed “filed” as part of this Annual Report on Form 10-K.
    
Entity Common Stock, Shares Outstanding   30,615,908  
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Central Index Key 0000067215