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Nature of Operations and Summary of Significant Accounting Policies - Company's Assets Measured at Fair Value (Detail) - USD ($)	Sep. 30, 2020	Sep. 30, 2019
Investment Holdings [Line Items]
Total	$ 89,498,000	$ 105,322,000
Level 1 [Member]
Investment Holdings [Line Items]
Total	61,621,000	66,632,000
Level 2 [Member]
Investment Holdings [Line Items]
Total	27,877,000	38,690,000
Equities [Member]
Investment Holdings [Line Items]
Total	11,949,000	10,412,000
Equities [Member] | Level 1 [Member]
Investment Holdings [Line Items]
Total	11,949,000	10,412,000
Mutual Funds [Member]
Investment Holdings [Line Items]
Total	9,595,000	3,987,000
Mutual Funds [Member] | Level 1 [Member]
Investment Holdings [Line Items]
Total	9,595,000	3,987,000
Exchange Traded Funds [Member]
Investment Holdings [Line Items]
Total	10,344,000	5,163,000
Exchange Traded Funds [Member] | Level 1 [Member]
Investment Holdings [Line Items]
Total	10,344,000	5,163,000
Corporate Bonds [Member]
Investment Holdings [Line Items]
Total	27,877,000	38,690,000
Corporate Bonds [Member] | Level 2 [Member]
Investment Holdings [Line Items]
Total	27,877,000	38,690,000
Government Securities [Member]
Investment Holdings [Line Items]
Total	16,147,000	45,171,000
Government Securities [Member] | Level 1 [Member]
Investment Holdings [Line Items]
Total	16,147,000	45,171,000
Cash and Money Funds [Member]
Investment Holdings [Line Items]
Total	13,586,000	1,899,000
Cash and Money Funds [Member] | Level 1 [Member]
Investment Holdings [Line Items]
Total	$ 13,586,000	$ 1,899,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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