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Net Income Per Common Unit - Additional Information (Details) - shares | 3 Months Ended | 6 Months Ended
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Mar. 31, 2018 | Mar. 25, 2017 | Mar. 31, 2018 | Mar. 25, 2017
Earnings Per Share [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) | 329,409 | 300,116 | 296,878 | 259,481

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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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