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Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 USD ($) wk Partnership shares | Sep. 24, 2016 USD ($) shares | Sep. 26, 2015 shares
Summary Of Significant Accounting Policies [Line Items] |  |  |
Limited partner interest in the Operating Partnership (in hundredths) | 100.00% |  |
Minimum number of weeks in the fiscal year reporting calendar | 52 |  |
Maximum number of weeks in the fiscal year reporting calendar | 53 |  |
Minimum number of weeks in a fiscal quarter | 13 |  |
Maximum number of weeks in a fiscal quarter | 14 |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Projection period for discounted cash flow analyses to estimate reporting unit fair value | 10 years |  |
Income Taxes [Abstract] |  |  |
Number of limited partnerships included in the partnership structure | Partnership | 2 |  |
Net Income Per Unit [Abstract] |  |  |
Increase in weighted average units outstanding used to compute basic net income per Common Unit to reflect the potential dilutive effect of the unvested restricted units outstanding (in units) | shares | 317,632 | 220,112 | 256,794
Total deferred debt issuance costs | $ | $ 19,219 | $ 17,391 |
Unamortized debt issuance costs | $ | $ 15,481 | $ 13,670 |
Storage facilities [Member] | Weighted Average [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Estimated useful life of the asset (in years) | 22 years |  |
Storage facilities [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Estimated useful life of the asset (in years) | 7 years |  |
Storage facilities [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Estimated useful life of the asset (in years) | 30 years |  |
Tanks and cylinders [Member} | Weighted Average [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Estimated useful life of the asset (in years) | 28 years |  |
Tanks and cylinders [Member} | Minimum [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Estimated useful life of the asset (in years) | 10 years |  |
Tanks and cylinders [Member} | Maximum [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Estimated useful life of the asset (in years) | 40 years |  |
Federal Funds Rate [Member] |  |  |
Interest Rate Risk [Abstract] |  |  |
Description of applicable interest rate on borrowings | Federal Funds Rate |  |
Basis spread (in hundredths) | 0.50% |  |
LIBOR [Member] |  |  |
Interest Rate Risk [Abstract] |  |  |
Description of applicable interest rate on borrowings | LIBOR |  |
Basis spread (in hundredths) | 1.00% |  |

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