Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Unrealized Loss	$ (1)
Short-term Securities	1,409	$ 7,945
Long-term Securities	130	249
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Basis	2,675	8,639
Gross Unrealized Gain	0	8
Gross Unrealized Loss	(1)	0
Fair Value	2,774	8,647
Cash Equivalents	1,235	453
Short-term Securities	1,409	7,945
Long-term Securities	130	249
Fair Value, Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Basis	1,235	301
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,235	301
Cash Equivalents	1,235	301
Short-term Securities	0	0
Long-term Securities	0	0
Fair Value, Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Basis	1,440	8,338
Gross Unrealized Gain	0	8
Gross Unrealized Loss	(1)	0
Fair Value	1,539	8,346
Cash Equivalents	0	152
Short-term Securities	1,409	7,945
Long-term Securities	130	249
Fair Value, Recurring [Member] \| Level 2 [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Basis	255	401
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	255	401
Cash Equivalents	0	152
Short-term Securities	255	0
Long-term Securities	0	249
Fair Value, Recurring [Member] \| Level 2 [Member] \| U.S. Government Agency Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Basis	195	2,591
Gross Unrealized Gain	0	3
Gross Unrealized Loss	0	0
Fair Value	295	2,594
Cash Equivalents	0	0
Short-term Securities	295	2,594
Long-term Securities	0	0
Fair Value, Recurring [Member] \| Level 2 [Member] \| Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Basis	990	2,127
Gross Unrealized Gain	0	2
Gross Unrealized Loss	(1)	0
Fair Value	989	2,129
Cash Equivalents	0	0
Short-term Securities	859	2,129
Long-term Securities	$ 130	0
Fair Value, Recurring [Member] \| Level 2 [Member] \| Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Basis		3,219
Gross Unrealized Gain		3
Gross Unrealized Loss		0
Fair Value		3,222
Cash Equivalents		0
Short-term Securities		3,222
Long-term Securities		$ 0

Fair value portion of asset recognized for present right to economic benefit.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of investment in marketable security, classified as current.

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Amount of investment in marketable security, classified as noncurrent.

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