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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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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 |  |

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- Definition Amount of each individual error being corrected in the correcting adjustment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 1.N.Q3) -URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 1 -Section N + Details
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