Document and Entity Information - USD ($)	12 Months Ended
	Sep. 29, 2018	Mar. 31, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	SUBURBAN PROPANE PARTNERS LP
Entity Central Index Key	0001005210
Current Fiscal Year End Date	--09-29
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float		$ 1,351,491,000
Entity Common Stock, Shares Outstanding	61,105,000
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Document Type	10-K
Trading Symbol	SPH
Amendment Flag	false
Document Period End Date	Sep. 29, 2018