Document and Entity Information	9 Months Ended
	Mar. 31, 2020
Document and Entity Information [Abstract]
Document Type	S-1
Amendment Flag	false
Entity Registrant Name	BILL.COM HOLDINGS, INC.
Entity Central Index Key	0001786352
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false