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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash, cash equivalents, and restricted cash |  | $ 52,708,000 | $ 139,188,000 | $ 100,508,000 | $ 48,999,000
Cash and cash equivalents |  | 52,458,000 | 139,188,000 |  |
Restricted cash |  | 250,000 |  |  |
Advertising and direct mail expenses |  | 15,100,000 | 14,900,000 | $ 14,500,000 |
Deferred charges and other assets, net |  | 9,843,000 | 11,074,000 |  |
Long-term debt |  | $ 65,717,000 | 75,441,000 |  |
Operating lease expiration year |  | 2032 |  |  |
Undiscounted future minimum lease payments through 2032 |  | $ 134,300,000 |  |  |
Quoted Prices in Active Markets for Identical Assets Level 1 |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Investments, debt securities |  | 11,300,000 |  |  |
Accounting Standards Update 2015-03 |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred charges and other assets, net |  |  | 11,074,000 |  |
Long-term debt |  |  | 75,411,000 |  |
Accounting Standards Update 2015-03 | Scenario, Previously Reported |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred charges and other assets, net |  |  | 11,900,000 |  |
Long-term debt |  |  | $ 76,300,000 |  |
Subsidiaries of Swiss Re |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
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 | $ 0 |  |  |
Maximum |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash equivalents, highly liquid investments maturity |  | 3 months |  |  |
Property and equipment, estimated useful lives |  | 30 years |  |  |
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 |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment, estimated useful lives |  | 3 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 |  |  |
Mutual Funds |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Investments, net asset value |  | $ 500,000 |  |  |

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