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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