| Document And Entity Information | Sep. 15, 2021 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | Due to a clerical error, the Form 8-K filed on September 16, 2021 (the “Original Filing”) announcing the results of the votes of the stockholders of SigmaTron International, Inc. (the “Company”) at the Company’s Annual Meeting of Stockholders on September 15, 2021, reflected that the stockholders voted to approve to transact such other business as may properly come before the Annual Meeting or any adjournment thereof; however, the stockholders voted not to approve to transact such other business. This Amendment corrects that statement in the final paragraph of Item 5.07 below to reflect that the stockholders voted not to approve to transact such other business as may properly come before the Annual Meeting or any adjournment thereof. |
| Document Period End Date | Sep. 15, 2021 |
| Entity Registrant Name | SIGMATRON INTERNATIONAL, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 0-23248 |
| Entity Tax Identification Number | 36-3918470 |
| Entity Address Address Line 1 | 2201 Landmeier Road |
| Entity Address City Or Town | Elk Grove Village |
| Entity Address State Or Province | IL |
| Entity Address Postal Zip Code | 60007 |
| City Area Code | 847 |
| Local Phone Number | 956-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Title of 12b Security | Common Stock $0.01 par value per share |
| Trading Symbol | SGMA |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000915358 |
