Document And Entity Information - shares	6 Months Ended
	Oct. 31, 2015	Dec. 10, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2015
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Trading Symbol	sgma
Entity Registrant Name	SIGMATRON INTERNATIONAL INC
Entity Central Index Key	0000915358
Current Fiscal Year End Date	--04-30
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		4,169,617