Document and Entity Information - USD ($)	12 Months Ended
	Mar. 30, 2018	Jun. 25, 2018	Sep. 29, 2017
Document and Entity Information:
Entity Registrant Name	AMERICAN TAX CREDIT TRUST SERIES I
Document Type	10-K
Document Period End Date	Mar. 30, 2018
Trading Symbol	atctix
Amendment Flag	false
Entity Central Index Key	0000897315
Current Fiscal Year End Date	--03-30
Entity Common Stock, Shares Outstanding		0
Entity Public Float			$ 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	2018
Document Fiscal Period Focus	FY