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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended
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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 | Sep. 30, 2010 | Mar. 31, 2014 Had The Items Been Recorded Timely | Dec. 30, 2013 Had The Items Been Recorded Timely | Sep. 30, 2013 Had The Items Been Recorded Timely | Sep. 30, 2012 Had The Items Been Recorded Timely | Sep. 30, 2011 Had The Items Been Recorded Timely | Sep. 30, 2010 Had The Items Been Recorded Timely | Jun. 30, 2014 Immaterial Error Correction | Jun. 30, 2014 Immaterial Error Correction | Jun. 30, 2014 Immaterial Error Correction Delivery And Branch Expenses | Jun. 30, 2014 Immaterial Error Correction Delivery And Branch Expenses | Jun. 30, 2014 Immaterial Error Correction Interest Accrued | Jun. 30, 2014 Immaterial Error Correction Interest Accrued | Jun. 30, 2014 Immaterial Error Correction Installation and Service Sales | Jun. 30, 2014 Immaterial Error Correction Installation and Service Sales | Jun. 30, 2014 Immaterial Error Correction Income Tax Benefit | Jun. 30, 2014 Immaterial Error Correction Income Tax Benefit | Jun. 30, 2014 Immaterial Error Correction Current Asset | Jun. 30, 2014 Immaterial Error Correction Accrued Expenses and Other Current Liabilities
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other taxes, related interest and penalties, and installation and service revenue overstatement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,700,000 |  | $ 1,700,000 | $ 1,700,000 | $ 1,400,000 | $ 1,200,000 | $ 600,000 | $ 300,000 | $ 1,500,000 | $ 1,300,000 | $ 2,600,000 | $ 1,100,000
Other taxes, related interest and penalties, and installation and service revenue overstatement, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  |  |  |  |  |  |  |  |  |  |
Reduction in net income |  |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 400,000 | 300,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (9,592,000) | 52,200,000 | 19,300,000 | (7,588,000) | 61,912,000 | 43,843,000 | 29,900,000 | 26,000,000 | 24,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total partners' capital | 306,091,000 |  |  |  | 306,091,000 |  | 259,281,000 |  |  | 279,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in partner's capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Description of error correction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | These errors did not, individually or in the aggregate, result in a material misstatement of our previously issued consolidated financial statements for any period through March 31, 2014. The correction of these errors in the third quarter of fiscal year 2014 was significant to our results of operations for the three months ended June 30, 2014, but had no material effect on our results for the nine months ended June 30, 2014 and is not expected to have a material effect on our results for the full year ending September 30, 2014. |  |  |  |  |  |  |  |  |  |
Finance charge income | $ 2,460,000 |  |  | $ 1,685,000 | $ 5,671,000 | $ 4,947,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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