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Earnings Per Limited Partner Unit (Tables) | 6 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Net Income Allocation and Per Unit Data | The following presents the net income allocation and per unit data using this method for the periods presented:
|  | Three Months Ended |  |  | Six Months Ended |
Basic and Diluted Earnings Per Limited Partner: |  | March 31, |  |  | March 31, |
(in thousands, except per unit data) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Net income |  | $ | 72,325 |  |  | $ | 54,778 |  |  | $ | 74,640 |  |  | $ | 84,960 |
Less General Partner’s interest in net income |  |  | 454 |  |  |  | 319 |  |  |  | 469 |  |  |  | 494 |
Net income available to limited partners |  |  | 71,871 |  |  |  | 54,459 |  |  |  | 74,171 |  |  |  | 84,466 |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  | 12,934 |  |  |  | 9,444 |  |  |  | 12,294 |  |  |  | 14,423 |
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 |  | $ | 58,937 |  |  | $ | 45,015 |  |  | $ | 61,877 |  |  | $ | 70,043 |
Per unit data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted net income available to limited partners |  | $ | 1.40 |  |  | $ | 0.98 |  |  | $ | 1.42 |  |  | $ | 1.51 |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  | 0.25 |  |  |  | 0.17 |  |  |  | 0.23 |  |  | $ | 0.25 |
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 |  | $ | 1.15 |  |  | $ | 0.81 |  |  | $ | 1.19 |  |  | $ | 1.26 |
Weighted average number of Limited Partner units outstanding |  |  | 51,427 |  |  |  | 55,642 |  |  |  | 52,174 |  |  |  | 55,766 |

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