| Cover | Mar. 01, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 1, 2021 |
| Entity File Number | 001-38102 |
| Entity Registrant Name | SMART GLOBAL HOLDINGS, INC. |
| Entity Central Index Key | 0001616533 |
| Entity Tax Identification Number | 98-1013909 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | c/o Maples Corporate Services Limited |
| Entity Address, Address Line Two | P.O. Box 309 |
| Entity Address, Address Line Three | Ugland House |
| Entity Address, City or Town | Grand Cayman |
| Entity Address, Country | KY |
| Entity Address, Postal Zip Code | KY1-1104 |
| City Area Code | 510 |
| Local Phone Number | 623-1231 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Ordinary shares, $0.03 par value per share |
| Trading Symbol | SGH |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
