Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Jul. 31, 2020	Aug. 31, 2020	Jan. 31, 2020
Cover [Abstract]
Entity Central Index Key	0001528396
Current Fiscal Year End Date	--07-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jul. 31, 2020
Document Transition Report	false
Entity File Number	001-35394
Entity Registrant Name	Guidewire Software, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-4468504
Entity Address, Address Line One	2850 S. Delaware St., Suite 400,
Entity Address, City or Town	San Mateo
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94403
City Area Code	650
Local Phone Number	357-9100
Title of 12(b) Security	Common Stock, $0.0001 par value
Trading Symbol	GWRE
Security Exchange Name	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
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Entity Public Float			$ 5.5
Entity Common Stock, Shares Outstanding (in shares)		83,474,780
Documents Incorporated by Reference	Portions of the registrant’s definitive Proxy Statement relating to its 2020 Annual Meeting of Stockholders are incorporated by reference into Part III of this report where indicated. Such Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.