Cover Page - shares	9 Months Ended
	Mar. 31, 2020	Apr. 28, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--06-30
Entity Registrant Name	HENRY JACK & ASSOCIATES INC
Entity Central Index Key	0000779152
Entity File Number	0-14112
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	43-1128385
Entity Address, Address Line One	663 Highway 60, P.O. Box 807
Entity Address, City or Town	Monett
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	65708
City Area Code	417
Local Phone Number	235-6652
Title of 12(b) Security	Common Stock ($0.01 par value)
Trading Symbol	JKHY
Security Exchange Name	NASDAQ
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		76,615,436