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Unit-Based Compensation Arrangements (Tables) | 12 Months Ended
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Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of activity In the Restricted Unit Plans | The following is a summary of activity in the Restricted Unit Plan:
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date Fair |
|  | Units |  |  | Value Per Unit |
Outstanding September 27, 2014 |  |  | 694,927 |  |  | $ | 32.07 |
Awarded |  |  | 154,403 |  |  |  | 37.59 |
Forfeited |  |  | (7,607 | ) |  |  | (31.04 | )
Vested |  |  | (214,324 | ) |  |  | (36.68 | )
Outstanding September 26, 2015 |  |  | 627,399 |  |  |  | 31.87 |
Awarded |  |  | 307,559 |  |  |  | 23.62 |
Forfeited |  |  | (12,057 | ) |  |  | (25.44 | )
Vested (1) |  |  | (268,781 | ) |  |  | (35.19 | )
Outstanding September 24, 2016 |  |  | 654,120 |  |  |  | 26.74 |
Awarded |  |  | 323,715 |  |  |  | 21.00 |
Forfeited |  |  | (6,737 | ) |  |  | (23.51 | )
Vested (1) |  |  | (350,053 | ) |  |  | (29.74 | )
Outstanding September 30, 2017 |  |  | 621,045 |  |  | $ | 22.10 |
| (1) | During fiscal 2017 and 2016, the Partnership withheld 34,883 and 10,477, respectively, Common Units from participants for income tax withholding purposes for those executive officers of the Partnership whose shares of restricted units vested during the period.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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