| Document and Entity Information | Dec. 04, 2020 |
| Entity Listings [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 4, 2020 |
| Entity Registrant Name | SERITAGE GROWTH PROPERTIES |
| Entity Incorporation, State or Country Code | MD |
| Entity File Number | 001-37420 |
| Entity Tax Identification Number | 38-3976287 |
| Entity Address, Address Line One | 500 Fifth Avenue, Suite 1530 |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10110 |
| City Area Code | 212 |
| Local Phone Number | 355-7800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001628063 |
| Common Class A [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Class A common shares of beneficial interest, par value $0.01 per share |
| Trading Symbol | SRG |
| Security Exchange Name | NYSE |
| Series A Preferred Stock [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | 7.00% Series A cumulative redeemable preferred shares of beneficial interest, par value $0.01 per share |
| Trading Symbol | SRG-PA |
| Security Exchange Name | NYSE |
