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Net Income Allocation and Per Unit Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016
Basic and Diluted Earnings Per Limited Partner: |  |  |  |  |
Net income |  | $ 39,704 | $ 55,209 | $ 57,979 | $ 67,267
Less General Partner's interest in net income |  | 233 | 313 | 338 | 381
Net income available to limited partners |  | 39,471 | 54,896 | 57,641 | 66,886
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  | 6,607 | 9,617 | 9,115 | 10,960
Limited Partner's interest in net income under FASB ASC 260-10-45-60 |  | $ 32,864 | $ 45,279 | $ 48,526 | $ 55,926
Per unit data: |  |  |  |  |
Basic and diluted net income available to limited partners |  | $ 0.71 | $ 0.96 | $ 1.03 | $ 1.17
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  | 0.12 | 0.17 | 0.16 | 0.19
Limited Partner's interest in net income under FASB ASC 260-10-45-60 | [1] | $ 0.59 | $ 0.79 | $ 0.87 | $ 0.98
Weighted average number of Limited Partner units outstanding |  | 55,888 | 57,242 | 55,888 | 57,262
[1] | See Note 13 Earnings Per Limited Partner Unit.

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