Cover Page - shares	9 Months Ended
	Oct. 30, 2021	Nov. 22, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Oct. 30, 2021
Document Transition Report	false
Entity File Number	001-10613
Entity Registrant Name	DYCOM INDUSTRIES, INC.
Entity Incorporation, State or Country Code	FL
Entity Tax Identification Number	59-1277135
Entity Address, Address Line One	11780 US Highway 1, Suite 600
Entity Address, City or Town	Palm Beach Gardens,
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33408
City Area Code	561
Local Phone Number	627-7171
Title of 12(b) Security	Common stock, par value $0.33 1/3 per share
Trading Symbol	DY
Security Exchange Name	NYSE
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		30,180,688
Entity Central Index Key	0000067215
Current Fiscal Year End Date	--01-29
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false