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Quarterly Distribution of Available Cash - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Selected Quarterly Financial Data [Line Items] |  |  |
Minimum distribution of available cash per unit | $ 0.0675 |  |
Common units distribution amount on annualized basis | $ 0.27 |  |
First tier, percentage of cash distribution to common units minimum quarterly distribution | 100.00% |  |
Second tier, percentage of available cash distribution to common units for any arrearages | 100.00% |  |
Third tier, percentage of available cash distribution to general partner unit holder until minimum quarterly distribution is met | 100.00% |  |
Fourth tier, percentage of distributions to common unit holders until first target distribution is met | 90.00% |  |
Fourth tier, percentage of distributions to general partner unit holder until first target distribution is met | 10.00% |  |
First target distribution | $ 0.1125 |  |
Thereafter, percentage of distributions to common unit holders after first target distribution is met | 80.00% |  |
Thereafter, percentage of distributions to general partner unit holders after first target distribution is met | 20.00% |  |
Percentage of excess availability of revolving commitment that must be maintained | 15.00% |  |
Fixed charge coverage ratio that must be maintained to make distributions | 115.00% |  |
Annual cash distributions declared per common unit | $ 0.34 | $ 0.32 | $ 0.31
General partner incentive distributions exclusive of amounts paid subject to management incentive plan | $ 0.2 | $ 0.2 | $ 0.1

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- Details
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