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Distributions of Available Cash - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
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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

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- Definition Maximum period after end of each term partnership makes distributions to its limited partners. + References No definition available. + Details
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Namespace Prefix: | sph_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Reduction in partnership's annual cash requirement. + References No definition available. + Details
Name: | sph_ReductionInAnnualCashRequirement
Namespace Prefix: | sph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DistributionsMadeToMembersOrLimitedPartnersAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration