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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Advertising and direct mail expenses |  | $ 14,900,000 | $ 14,500,000 | $ 12,500,000
Deferred tax assets, net |  | 5,353,000 | 16,308,000 |
Accounting Standards Update 2015-17 |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Current deferred tax assets, net |  | 0 |  |
Long-term deferred tax liabilities, net |  | 0 |  |
Deferred tax assets, net |  | 16,300,000 |  |
Accounting Standards Update 2015-17 | Scenario, Previously Reported |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Current deferred tax assets, net |  | 37,800,000 |  |
Long-term deferred tax liabilities, net |  | 21,500,000 |  |
Deferred tax assets, net |  | 0 |  |
Subsidiaries of Swiss Re |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Weather hedge contract, payment entitled to be received per heating degree-day shortfall |  | $ 35,000 | $ 35,000 | $ 35,000
Percentage in heating degree days less than ten year average that is covered |  | 92.50% |  |
Derivative maximum payout |  | $ 12,500,000 |  |
Subsidiaries of Swiss Re | Delivery and branch expenses |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Credit on weather hedge contract | $ 12,500,000 |  |  |
Maximum |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Cash equivalents, highly liquid investments maturity |  | 3 months |  |
Maximum | Customer Lists |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets, amortization period |  | 10 years |  |
Maximum | Trade Names |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets, amortization period |  | 20 years |  |
Minimum | Customer Lists |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets, amortization period |  | 7 years |  |
Minimum | Trade Names |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets, amortization period |  | 7 years |  |

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