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Net Income Allocation and Per Unit Data (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
$ / shares
$ / PartnershipUnit
shares
Jun. 30, 2014
USD ($)
$ / shares
$ / PartnershipUnit
shares
Jun. 30, 2015
USD ($)
$ / shares
$ / PartnershipUnit
shares
Jun. 30, 2014
USD ($)
$ / shares
$ / PartnershipUnit
shares
Basic and Diluted Earnings Per Limited Partner:        
Net income (loss) $ (8,359) $ (9,592) $ 82,882 $ 61,912
Less General Partner's interest in net income (loss) (47) (54) 469 349
Net income (loss) available to limited partners (8,312) (9,538) 82,413 61,563
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60     13,128 9,152
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 $ (8,312) $ (9,538) $ 69,285 $ 52,411
Per unit data:        
Basic and diluted net income (loss) available to limited partners | $ / PartnershipUnit (0.15) (0.17) 1.44 1.07
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 | $ / PartnershipUnit     0.23 0.16
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 | $ / shares [1] $ (0.15) $ (0.17) $ 1.21 $ 0.91
Weighted average number of Limited Partner units outstanding | shares 57,282 57,468 57,286 57,482
[1] See Note 13 Earnings (Loss) Per Limited Partner Unit.