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