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Earnings Per Limited Partner Unit - 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, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Basic and Diluted Earnings Per Limited Partner: |  |  |  |  |
Net income |  | $ 58,408 | $ 72,325 | $ 86,163 | $ 74,640
Less General Partner’s interest in net income |  | 409 | 454 | 601 | 469
Net income available to limited partners |  | 57,999 | 71,871 | 85,562 | 74,171
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  | 10,283 | 12,934 | 14,631 | 12,294
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 |  | $ 47,716 | $ 58,937 | $ 70,931 | $ 61,877
Per unit data: |  |  |  |  |
Basic and diluted net income available to limited partners |  | $ 1.25 | $ 1.40 | $ 1.83 | $ 1.42
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  | 0.22 | 0.25 | 0.31 | 0.23
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 | [1] | $ 1.03 | $ 1.15 | $ 1.52 | $ 1.19
Weighted average number of Limited Partner units outstanding |  | 46,244 | 51,427 | 46,760 | 52,174
[1] | See Note 16 - Earnings Per Limited Partner Unit.

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