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Earnings Per Limited Partner Unit (Tables) | 6 Months Ended
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Mar. 31, 2018
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) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Net income |  | $ | 54,778 |  |  | $ | 39,704 |  |  | $ | 84,960 |  |  | $ | 57,979 |
Less General Partner’s interest in net income |  |  | 319 |  |  |  | 233 |  |  |  | 494 |  |  |  | 338 |
Net income available to limited partners |  |  | 54,459 |  |  |  | 39,471 |  |  |  | 84,466 |  |  |  | 57,641 |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  | 9,444 |  |  |  | 6,607 |  |  |  | 14,423 |  |  |  | 9,115 |
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 |  | $ | 45,015 |  |  | $ | 32,864 |  |  | $ | 70,043 |  |  | $ | 48,526 |
Per unit data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted net income available to limited partners |  | $ | 0.98 |  |  | $ | 0.71 |  |  | $ | 1.51 |  |  | $ | 1.03 |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  | 0.17 |  |  |  | 0.12 |  |  |  | 0.25 |  |  | $ | 0.16 |
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 |  | $ | 0.81 |  |  | $ | 0.59 |  |  | $ | 1.26 |  |  | $ | 0.87 |
Weighted average number of Limited Partner units outstanding |  |  | 55,642 |  |  |  | 55,888 |  |  |  | 55,766 |  |  |  | 55,888 |

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