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Net Income Allocation and Per Unit Data (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Basic and Diluted Earnings Per Limited Partner:        
Net income $ 41,679 $ 40,482 $ 51,431 $ 43,413
Less General Partners' interest in net income 225 213 278 228
Net income available to limited partners 41,454 40,269 51,153 43,185
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 6,993 6,656 7,991 6,339
Limited Partner's interest in net income under FASB ASC 260-10-45-60 $ 34,461 $ 33,613 $ 43,162 $ 36,846
Per unit data:        
Basic and diluted net income available to limited partners 0.69 0.66 0.85 0.69
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 0.11 0.11 0.13 0.10
Limited Partner's interest in net income under FASB ASC 260-10-45-60 0.58 [1] 0.55 [1] 0.72 [1] 0.59 [1]
Weighted average number of Limited Partner units outstanding 59,837 61,474 60,192 62,839
[1] See Note 13 - Earnings (Loss) Per Limited Partner Unit.