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Document and Entity Information - shares shares in Millions	3 Months Ended
	Apr. 30, 2018	May 31, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	Workday, Inc.
Entity Central Index Key	0001327811
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Apr. 30, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Trading Symbol	WDAY
Entity Common Stock, Shares Outstanding		216

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Document And Entity Information [Abstract]

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