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Net Income Allocation and Per Unit Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Basic and Diluted Earnings Per Limited Partner: |  |  |
Net income |  | $ 2,315 | $ 30,182
Less General Partner’s interest in net income |  | 15 | 175
Limited Partners’ interest in net income |  | 2,300 | 30,007
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  | 4,740
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 |  | $ 2,300 | $ 25,267
Per unit data: |  |  |
Basic and diluted net income available to limited partners |  | $ 0.04 | $ 0.53
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  | 0.08
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 | [1] | $ 0.04 | $ 0.45
Weighted average number of Limited Partner units outstanding |  | 52,905 | 55,888
[1] | See Note 15 - Earnings Per Limited Partner Unit.

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