Distributions of Available Cash - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 26, 2020	Jul. 23, 2020
Distributions Made To Members Or Limited Partners [Abstract]
Distributions to its partners	45 days
Reduction in annual cash requirement		$ 75,000

Maximum period after end of each term partnership makes distributions to its limited partners.

No definition available.

Name:	sph_MaximumPeriodAfterEndOfEachTermPartnershipMakesDistributionsToItsLimitedPartners
Namespace Prefix:	sph_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration