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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 | 6 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013
Basic and Diluted Earnings Per Limited Partner: |  |  |  |  |  |  |  |
Net income | $ 52,216 |  | $ 41,679 |  | $ 71,504 |  | $ 51,431 |
Less General Partners' interest in net income | 294 |  | 225 |  | 403 |  | 278 |
Net income available to limited partners | 51,922 |  | 41,454 |  | 71,101 |  | 51,153 |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 | 9,065 |  | 6,993 |  | 11,922 |  | 7,991 |
Limited Partner's interest in net income under FASB ASC 260-10-45-60 | $ 42,857 |  | $ 34,461 |  | $ 59,179 |  | $ 43,162 |
Per unit data: |  |  |  |  |  |  |  |
Basic and diluted net income available to limited partners | 0.90 |  | 0.69 |  | 1.24 |  | 0.85 |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 | 0.15 |  | 0.11 |  | 0.21 |  | 0.13 |
Limited Partner's interest in net income under FASB ASC 260-10-45-60 | $ 0.75 | [1] | $ 0.58 | [1] | $ 1.03 | [1] | $ 0.72 | [1]
Weighted average number of Limited Partner units outstanding | 57,468 |  | 59,837 |  | 57,490 |  | 60,192 |
[1] | See Note 14 Earnings Per Limited Partner Unit.

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