Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 27, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Trading Symbol	SRG
Entity Registrant Name	SERITAGE GROWTH PROPERTIES
Entity Central Index Key	0001628063
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Class A Common Shares [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		35,685,933
Class B Common Shares [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,322,365
Class C Common Shares [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		850