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Nature of Operations and Summary of Significant Accounting Policies - Company's Assets Measured at Fair Value (Detail) (USD $) | Sep. 30, 2014 | Sep. 30, 2013
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 87,112,000 | $ 83,113,000
Equities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 17,102,000 | 12,634,000
Mutual Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 19,088,000 | 28,264,000
Exchange-Traded Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 1,764,000 | 5,162,000
Government Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 43,999,000 | 2,000,000
Cash and Money Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 5,159,000 | 2,122,000
Corporate Bonds [Member] |  |
Investment Holdings [Line Items] |  |
Total |  | 17,376,000
Municipal Bonds [Member] |  |
Investment Holdings [Line Items] |  |
Total |  | 15,555,000
Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 87,112,000 | 50,182,000
Level 1 [Member] | Equities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 17,102,000 | 12,634,000
Level 1 [Member] | Mutual Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 19,088,000 | 28,264,000
Level 1 [Member] | Exchange-Traded Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 1,764,000 | 5,162,000
Level 1 [Member] | Government Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 43,999,000 | 2,000,000
Level 1 [Member] | Cash and Money Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 5,159,000 | 2,122,000
Level 2 [Member] |  |
Investment Holdings [Line Items] |  |
Total |  | 32,931,000
Level 2 [Member] | Corporate Bonds [Member] |  |
Investment Holdings [Line Items] |  |
Total |  | 17,376,000
Level 2 [Member] | Municipal Bonds [Member] |  |
Investment Holdings [Line Items] |  |
Total |  | $ 15,555,000

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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