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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 | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Basic and Diluted Earnings Per Limited Partner: |  |  |  |  |
Net income (loss) |  | $ (23,098) | $ (8,005) | $ 51,542 | $ 76,955
Less General Partner’s interest in net income (loss) |  | (150) | (49) | 319 | 445
Limited Partners’ interest in net income (loss) |  | (22,948) | (7,956) | 51,223 | 76,510
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  |  | 6,740 | 11,610
Limited Partner’s interest in net income (loss) under FASB ASC 260-10-45-60 |  | $ (22,948) | $ (7,956) | $ 44,483 | $ 64,900
Per unit data: |  |  |  |  |
Basic and diluted net income (loss) available to limited partners |  | $ (0.46) | $ (0.15) | $ 1.00 | $ 1.39
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  |  | 0.14 | 0.21
Limited Partner’s interest in net income (loss) under FASB ASC 260-10-45-60 | [1] | $ (0.46) | $ (0.15) | $ 0.86 | $ 1.18
Weighted average number of Limited Partner units outstanding |  | 49,943 | 53,938 | 51,431 | 55,157
[1] | See Note 15 - Earnings Per Limited Partner Unit.

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