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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
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