Document and Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2017	Mar. 25, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	SUBURBAN PROPANE PARTNERS LP
Entity Central Index Key	0001005210
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float		$ 1,623,532,000
Entity Common Stock, Shares Outstanding	61,105,000
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Document Type	10-K
Trading Symbol	SPH
Amendment Flag	false
Document Period End Date	Sep. 30, 2017