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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Schedule Of Significant Accounting Policies [Line Items]      
Advertising and direct mail expenses $ 12,500,000 $ 10,500,000 $ 9,600,000
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    
Percentage in heating degree days less than ten year average that is covered 92.50%    
Derivative maximum payout 12,500,000    
Maximum
      
Schedule Of Significant Accounting Policies [Line Items]      
Cash equivalents, highly liquid investments maturity 3 months    
Customer Lists | Maximum
      
Schedule Of Significant Accounting Policies [Line Items]      
Intangible assets, amortization period 10 years    
Customer Lists | Minimum
      
Schedule Of Significant Accounting Policies [Line Items]      
Intangible assets, amortization period 7 years    
Trade Names | Maximum
      
Schedule Of Significant Accounting Policies [Line Items]      
Intangible assets, amortization period 20 years    
Trade Names | Minimum
      
Schedule Of Significant Accounting Policies [Line Items]      
Intangible assets, amortization period 7 years    
Noncompete Agreements
      
Schedule Of Significant Accounting Policies [Line Items]      
Intangible assets, amortization period 5 years    
Immaterial Error Correction
      
Schedule Of Significant Accounting Policies [Line Items]      
Other taxes, related interest and penalties, and installation and service revenue overstatement, net of tax 2,200,000    
Other taxes, related interest and penalties, and installation and service revenue overstatement $ 3,700,000