Document and Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2019	May 24, 2019	Sep. 30, 2018
Document and Entity Information [Abstract]
Document Type	10-K
Document Period End Date	Mar. 31, 2019
Entity Registrant Name	TESSCO TECHNOLOGIES INC
Entity Central Index Key	0000927355
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 98,115,679
Entity Common Stock, Shares Outstanding		8,513,119