Document and Entity Information - shares	9 Months Ended
	Feb. 28, 2019	Jun. 21, 2019
Document And Entity Information
Entity Registrant Name	MOMENTOUS HOLDINGS CORP.
Entity Central Index Key	0001653876
Document Type	10-Q
Document Period End Date	Feb. 28, 2019
Amendment Flag	false
Current Fiscal Year End Date	--05-31
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		34,015,000
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2019
Emerging Growth Company	true
Transition Period	false
Small Business Entity	true
Interactive data current?	Yes
Incorporation state	NV
Entity file number	333-20163
Entity shell company	false