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Net Income Allocation and Per Unit Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Basic and Diluted Earnings Per Limited Partner: |  |  |  |  |  |  |  |
Net income (loss) | $ (7,588) |  | $ (11,789) |  | $ 43,843 |  | $ 31,624 |
Less General Partners' interest in net income (loss) | (41) |  | (62) |  | 237 |  | 166 |
Net income (loss) available to limited partners | (7,547) |  | (11,727) |  | 43,606 |  | 31,458 |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  |  |  | 5,623 |  | 3,141 |
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 | $ (7,547) |  | $ (11,727) |  | $ 37,983 |  | $ 28,317 |
Per unit data: |  |  |  |  |  |  |  |
Basic and diluted net income (loss) available to limited partners | (0.13) |  | (0.19) |  | 0.73 |  | 0.51 |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  |  |  |  | 0.10 |  | 0.05 |
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 | $ (0.13) | [1] | $ (0.19) | [1] | $ 0.63 | [1] | $ 0.46 | [1]
Weighted average number of Limited Partner units outstanding | 59,370 |  | 61,024 |  | 59,918 |  | 62,236 |
[1] | See Note 14 - Earnings (Loss) Per Limited Partner Unit.

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