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Marketable Securities - Company's Assets Measured at Fair Value (Detail) - USD ($)	Mar. 31, 2020	Sep. 30, 2019
Investment Holdings [Line Items]
Total	$ 102,275,000	$ 105,322,000
Equities [Member]
Investment Holdings [Line Items]
Total	12,458,000	10,412,000
Mutual Funds [Member]
Investment Holdings [Line Items]
Total	2,290,000	3,987,000
Exchange Traded Funds [Member]
Investment Holdings [Line Items]
Total	4,005,000	5,163,000
Corporate Bonds [Member]
Investment Holdings [Line Items]
Total	39,721,000	38,690,000
Government Securities [Member]
Investment Holdings [Line Items]
Total	40,315,000	45,171,000
Cash and Money Funds [Member]
Investment Holdings [Line Items]
Total	3,486,000	1,899,000
Level 1 [Member]
Investment Holdings [Line Items]
Total	62,554,000	66,632,000
Level 1 [Member] | Equities [Member]
Investment Holdings [Line Items]
Total	12,458,000	10,412,000
Level 1 [Member] | Mutual Funds [Member]
Investment Holdings [Line Items]
Total	2,290,000	3,987,000
Level 1 [Member] | Exchange Traded Funds [Member]
Investment Holdings [Line Items]
Total	4,005,000	5,163,000
Level 1 [Member] | Government Securities [Member]
Investment Holdings [Line Items]
Total	40,315,000	45,171,000
Level 1 [Member] | Cash and Money Funds [Member]
Investment Holdings [Line Items]
Total	3,486,000	1,899,000
Level 2 [Member]
Investment Holdings [Line Items]
Total	39,721,000	38,690,000
Level 2 [Member] | Corporate Bonds [Member]
Investment Holdings [Line Items]
Total	$ 39,721,000	$ 38,690,000

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Amount of investment in marketable security, classified as current.

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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=118951113&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=6877327&loc=d3e13212-122682

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