Document and Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2021	May 14, 2021	Sep. 30, 2020
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Registrant Name	AGILYSYS, INC.
Entity Central Index Key	0000078749
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		23,894,595
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Shares, without par value
Trading Symbol	AGYS
Security Exchange Name	NASDAQ
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity File Number	0-5734
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	34-0907152
Entity Address, Address Line One	1000 Windward Concourse
Entity Address, Address Line Two	Suite 250
Entity Address, City or Town	Alpharetta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30005
City Area Code	770
Local Phone Number	810-7800
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
ICFR Auditor Attestation Flag	true
Entity Public Float			$ 473,711,377
Documents Incorporated by Reference	Portions of the registrant’s definitive Proxy Statement to be used in connection with its 2021 Annual Meeting of Shareholders are incorporated by reference into Part III of this Form 10-K