| Cover | Dec. 11, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 11, 2020 |
| Current Fiscal Year End Date | --03-28 |
| Entity File Number | 001-33938 |
| Entity Registrant Name | TESSCO Technologies Incorporated |
| Entity Central Index Key | 0000927355 |
| Entity Tax Identification Number | 52-0729657 |
| Entity Incorporation, State or Country Code | DE |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value per share |
| Trading Symbol | TESS |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
