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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, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Basic and Diluted Earnings Per Limited Partner: |  |  |  |  |
Net income |  | $ 54,778 | $ 39,704 | $ 84,960 | $ 57,979
Less General Partner’s interest in net income |  | 319 | 233 | 494 | 338
Limited Partners’ interest in net income |  | 54,459 | 39,471 | 84,466 | 57,641
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  | 9,444 | 6,607 | 14,423 | 9,115
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 |  | $ 45,015 | $ 32,864 | $ 70,043 | $ 48,526
Per unit data: |  |  |  |  |
Basic and diluted net income available to limited partners |  | $ 0.98 | $ 0.71 | $ 1.51 | $ 1.03
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  | 0.17 | 0.12 | 0.25 | 0.16
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 | [1] | $ 0.81 | $ 0.59 | $ 1.26 | $ 0.87
Weighted average number of Limited Partner units outstanding |  | 55,642 | 55,888 | 55,766 | 55,888
[1] | See Note 13 - Earnings Per Limited Partner Unit.

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