Document and Entity Information - shares	9 Months Ended
	Dec. 29, 2019	Jan. 31, 2020
Document and Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Dec. 29, 2019
Entity Registrant Name	TESSCO TECHNOLOGIES INC
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		8,547,747
Entity Central Index Key	0000927355
Current Fiscal Year End Date	--03-29
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false