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Earnings Per Limited Partner Unit - Net Income Allocation and Per Unit Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Basic and Diluted Earnings Per Limited Partner: |  |  |  |  |  |  |
Net income |  | $ 72,325 | $ 2,315 | $ 54,778 | $ 30,182 | $ 74,640 | $ 84,960
Less General Partner’s interest in net income |  | 454 |  | 319 |  | 469 | 494
Limited Partners’ interest in net income |  | 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] | $ 1.15 |  | $ 0.81 |  | $ 1.19 | $ 1.26
Weighted average number of Limited Partner units outstanding |  | 51,427 |  | 55,642 |  | 52,174 | 55,766
[1] | See Note 15 - Earnings Per Limited Partner Unit.

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