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Net Income Allocation and Per Unit Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Basic and Diluted Earnings Per Limited Partner: |  |  |  |  |
Net income (loss) |  | $ (13,332) | $ (3,238) | $ 44,647 | $ 64,029
Less General Partner's interest in net income |  | (79) | (19) | 259 | 362
Net income (loss) available to limited partners |  | (13,253) | (3,219) | 44,388 | 63,667
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  |  | 5,420 | 9,313
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 |  | $ (13,253) | $ (3,219) | $ 38,968 | $ 54,354
Per unit data: |  |  |  |  |
Basic and diluted net income (loss) available to limited partners |  | $ (0.24) | $ (0.06) | $ 0.79 | $ 1.11
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  |  | 0.09 | 0.16
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 | [1] | $ (0.24) | $ (0.06) | $ 0.70 | $ 0.95
Weighted average number of Limited Partner units outstanding |  | 55,888 | 57,188 | 55,888 | 57,237
[1] | See Note 13 Earnings Per Limited Partner Unit.

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