Document and Entity Information - USD ($)	12 Months Ended
	Mar. 30, 2019	Aug. 31, 2018
Details
Registrant Name	AMERICAN TAX CREDIT PROPERTIES III LP
Registrant CIK	0000856135
SEC Form	10-K
Period End date	Mar. 30, 2019
Fiscal Year End	--03-30
Tax Identification Number (TIN)	13-3545006
Number of common stock shares outstanding	0
Public Float		$ 0
Filer Category	Non-accelerated Filer
Current with reporting	Yes
Interactive Data Current	Yes
Voluntary filer	No
Well-known Seasoned Issuer	No
Shell Company	false
Small Business	true
Emerging Growth Company	false
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Document Annual Report	true
Document Transition Report	false
Entity Incorporation, State Country Name	Delaware
Entity Address, Address Line One	777 West Putnam Avenue
Entity Address, City or Town	Greenwich
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06830
City Area Code	(203)
Local Phone Number	869-0900