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Net Income Allocation and Per Unit Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 30, 2013
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Basic and Diluted Earnings Per Limited Partner:                  
Net income (loss) $ (9,592) $ 52,200 $ 19,300 $ (7,588) $ 61,912 $ 43,843 $ 29,900 $ 26,000 $ 24,300
Less General partner's interest in net income (loss) (54)     (41) 349 237      
Net income (loss) available to limited partners (9,538)     (7,547) 61,563 43,606      
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60         9,152 5,623      
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 $ (9,538)     $ (7,547) $ 52,411 $ 37,983      
Per unit data:                  
Basic and diluted net income (loss) available to limited partners (0.17)     (0.13) 1.07 0.73      
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60         0.16 0.10      
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 $ (0.17) [1]     $ (0.13) [1] $ 0.91 [1] $ 0.63 [1]      
Weighted average number of Limited Partner units outstanding 57,468     59,370 57,482 59,918      
[1] See Note 14 Earnings (Loss) Per Limited Partner Unit.