| Document And Entity Information | Oct. 31, 2019 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 31, 2019 |
| Entity Registrant Name | SERITAGE GROWTH PROPERTIES |
| Entity Central Index Key | 0001628063 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-37420 |
| Entity Incorporation, State or Country Code | MD |
| Entity Tax Identification Number | 38-3976287 |
| Entity Address, Address Line One | 500 Fifth Avenue |
| Entity Address, Address Line Two | 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 |
| Class A Common Shares [Member] | |
| Document And Entity Information [Line Items] | |
| Title of each class | Class A common shares of beneficial interest, par value $0.01 per share |
| Trading Symbols | SRG |
| Name of each exchange on which registered | NYSE |
| Series A Cumulative Redeemable Preferred Shares [Member] | |
| Document And Entity Information [Line Items] | |
| Title of each class | 7.00% Series A cumulative redeemable preferred shares of beneficial interest, par value $0.01 per share |
| Trading Symbols | SRG-PA |
| Name of each exchange on which registered | NYSE |
