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Net Income Allocation and Per Unit Data (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic and Diluted Earnings Per Limited Partner:        
Net income (loss) $ (3,238) $ (8,359) $ 64,029 $ 82,882
Less General Partner's interest in net income (loss) (19) (47) 362 469
Net income (loss) available to limited partners (3,219) (8,312) 63,667 82,413
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60     9,313 13,128
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 $ (3,219) $ (8,312) $ 54,354 $ 69,285
Per unit data:        
Basic and diluted net income (loss) available to limited partners $ (0.06) $ (0.15) $ 1.11 $ 1.44
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60     0.16 0.23
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 [1] $ (0.06) $ (0.15) $ 0.95 $ 1.21
Weighted average number of Limited Partner units outstanding 57,188 57,282 57,237 57,286
[1] See Note 13 Earnings Per Limited Partner Unit.