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Marketable Securities - Company's Assets Measured at Fair Value (Detail) - USD ($)	Dec. 31, 2016	Sep. 30, 2016
Investment Holdings [Line Items]
Total	$ 86,386,000	$ 85,938,000
Equities [Member]
Investment Holdings [Line Items]
Total	3,265,000	2,408,000
Mutual Funds [Member]
Investment Holdings [Line Items]
Total	5,275,000	5,212,000
Exchange Traded Funds [Member]
Investment Holdings [Line Items]
Total	738,000	510,000
Government Securities [Member]
Investment Holdings [Line Items]
Total	69,757,000	69,583,000
Cash and Money Funds [Member]
Investment Holdings [Line Items]
Total	7,351,000	8,225,000
Level 1 [Member]
Investment Holdings [Line Items]
Total	86,386,000	85,938,000
Level 1 [Member] | Equities [Member]
Investment Holdings [Line Items]
Total	3,265,000	2,408,000
Level 1 [Member] | Mutual Funds [Member]
Investment Holdings [Line Items]
Total	5,275,000	5,212,000
Level 1 [Member] | Exchange Traded Funds [Member]
Investment Holdings [Line Items]
Total	738,000	510,000
Level 1 [Member] | Government Securities [Member]
Investment Holdings [Line Items]
Total	69,757,000	69,583,000
Level 1 [Member] | Cash and Money Funds [Member]
Investment Holdings [Line Items]
Total	$ 7,351,000	$ 8,225,000

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Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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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