Document and Entity Information - shares	3 Months Ended
	Jul. 31, 2018	Dec. 07, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	QUANTA INC
Entity Central Index Key	0001691430
Current Fiscal Year End Date	--04-30
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		39,200,090
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1