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Goodwill and Other Intangible Assets - Additional Information (Details) | 6 Months Ended
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Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Projection period for discounted cash flow analyses to estimate reporting unit fair value | 10 years

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- Definition The length in years of the projection period used in estimating the fair value of the reporting unit using discounted cash flow analyses. + References No definition available. + Details
Name: | sph_ProjectionPeriodForDiscountedCashFlowAnalysesToEstimateReportingUnitFairValue
Namespace Prefix: | sph_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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