Document and Entity Information - shares	9 Months Ended
	Dec. 27, 2020	Jan. 29, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 27, 2020
Document Transition Report	false
Entity File Number	001-33938
Entity Registrant Name	TESSCO Technologies Incorporated
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	52-0729657
Entity Address, Address Line One	11126 McCormick Road
Entity Address, City or Town	Hunt Valley
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	21031
City Area Code	410
Local Phone Number	229-1000
Title of 12(b) Security	Common Stock
Trading Symbol	TESS
Security Exchange Name	NASDAQ
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		8,828,066
Entity Central Index Key	0000927355
Current Fiscal Year End Date	--03-28
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false