Document and Entity Information - shares	3 Months Ended
	Jun. 29, 2018	Aug. 03, 2018
Document and Entity Information:
Entity Registrant Name	AMERICAN TAX CREDIT PROPERTIES III LP
Document Type	10-Q
Document Period End Date	Jun. 29, 2018
Trading Symbol	atciiix
Amendment Flag	false
Entity Central Index Key	0000856135
Current Fiscal Year End Date	--03-30
Entity Common Stock, Shares Outstanding		0
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1