Document and Entity Information - USD ($) shares in Millions, $ in Billions	12 Months Ended
	Jan. 31, 2026	Mar. 04, 2026	Jul. 31, 2025
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jan. 31, 2026
Current Fiscal Year End Date	--01-31
Document Transition Report	false
Entity File Number	001-35680
Entity Registrant Name	WORKDAY, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-2480422
Entity Address, Address Line One	6110 Stoneridge Mall Road
Entity Address, City or Town	Pleasanton
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94588
City Area Code	925
Local Phone Number	951-9000
Title of 12(b) Security	Class A Common Stock, par value $0.001
Trading Symbol	WDAY
Security Exchange Name	NASDAQ
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
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 49.5
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for its 2026 Annual Meeting of Stockholders (“Proxy Statement”), to be filed within 120 days of the registrant’s fiscal year ended January 31, 2026, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	FY
Entity Central Index Key	0001327811
Class A
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		210
Class B
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		47