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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 | Jul. 31, 2012 Swiss Re Financial Products Corporation | Sep. 30, 2013 Swiss Re Financial Products Corporation | Sep. 30, 2013 Maximum | Sep. 30, 2013 Noncompete Agreements | Sep. 30, 2013 Customer Lists Minimum | Sep. 30, 2013 Customer Lists Maximum | Sep. 30, 2013 Trade Names Minimum | Sep. 30, 2013 Trade Names Maximum
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finance charge income | $ 5,521,000 | $ 4,393,000 | $ 4,814,000 |  |  |  |  |  |  |  |
Cash equivalents, highly liquid investments maturity |  |  |  |  |  | 3 months |  |  |  |  |
Intangible assets, amortization period |  |  |  |  |  |  | 5 years | 7 years | 10 years | 7 years | 20 years
Advertising and direct mail expenses | 10,500,000 | 9,600,000 | 9,500,000 |  |  |  |  |  |  |  |
weather hedge contract, payment entitled to be received per heating degree-day shortfall |  |  |  | 35,000 |  |  |  |  |  |  |
Percentage in heating degree days less than ten year average that is covered |  |  |  | 92.50% |  |  |  |  |  |  |
Derivative maximum payout |  |  |  |  | $ 12,500,000 |  |  |  |  |  |

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