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Net Income Allocation and Per Unit Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Basic and Diluted Earnings Per Limited Partner: |  |  |
Net income |  | $ 30,182 | $ 18,275
Less General Partner’s interest in net income |  | 175 | 105
Limited Partners’ interest in net income |  | 30,007 | 18,170
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  | 4,740 | 2,446
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 |  | $ 25,267 | $ 15,724
Per unit data: |  |  |
Basic and diluted net income available to limited partners |  | $ 0.53 | $ 0.33
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 |  | 0.08 | 0.05
Limited Partner’s interest in net income under FASB ASC 260-10-45-60 | [1] | $ 0.45 | $ 0.28
Basic and Diluted |  | 55,887 | 55,887
[1] | See Note 13 - Earnings Per Limited Partner Unit.

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