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Partnership Organization and Formation - Additional Information (Details) - shares | Dec. 26, 2015 | Sep. 26, 2015
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Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items] |  |
Common units outstanding (in units) | 60,744,727 | 60,531,000
Ownership interest in Suburban Energy Finance Corp (in hundredths) | 100.00% |
General Partner [Member] | Common Unitholders [Member] |  |
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items] |  |
Common units outstanding (in units) | 784 |

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