Cover Page - shares	3 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	0-25259
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Registrant Name	BOTTOMLINE TECHNOLOGIES INC /DE/
Entity Central Index Key	0001073349
Current Fiscal Year End Date	--06-30
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	02-0433294
Entity Address, Address Line One	325 Corporate Drive
Entity Address, City or Town	Portsmouth,
Entity Address, State or Province	NH
Entity Address, Postal Zip Code	03801-6808
City Area Code	603
Local Phone Number	436-0700
Title of 12(b) Security	Common Stock, $.001 par value per share
Trading Symbol	EPAY
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		43,965,634