Fair Value Measurements - Unrealized Loss on Investments (Details) - USD ($)	Dec. 31, 2024	Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized loss position, less than 12 months, fair value	$ 2,286,000
Unrealized loss position, less than 12 months, gross unrealized loss	(1,000)
Unrealized loss position, more than 12 months, fair value	0
Unrealized loss position, more than 12 months, gross unrealized loss	0
Unrealized loss position, fair value	2,286,000	$ 0
Unrealized loss position, gross unrealized loss	(1,000)
Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized loss position, less than 12 months, fair value	0
Unrealized loss position, less than 12 months, gross unrealized loss	0
Unrealized loss position, more than 12 months, fair value	0
Unrealized loss position, more than 12 months, gross unrealized loss	0
Unrealized loss position, fair value	0
Unrealized loss position, gross unrealized loss	0
U.S. Government Agency Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized loss position, less than 12 months, fair value	292,000
Unrealized loss position, less than 12 months, gross unrealized loss	0
Unrealized loss position, more than 12 months, fair value	0
Unrealized loss position, more than 12 months, gross unrealized loss	0
Unrealized loss position, fair value	292,000
Unrealized loss position, gross unrealized loss	0
Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized loss position, less than 12 months, fair value	1,447,000
Unrealized loss position, less than 12 months, gross unrealized loss	(1,000)
Unrealized loss position, more than 12 months, fair value	0
Unrealized loss position, more than 12 months, gross unrealized loss	0
Unrealized loss position, fair value	1,447,000
Unrealized loss position, gross unrealized loss	(1,000)
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized loss position, less than 12 months, fair value	547,000
Unrealized loss position, less than 12 months, gross unrealized loss	0
Unrealized loss position, more than 12 months, fair value	0
Unrealized loss position, more than 12 months, gross unrealized loss	0
Unrealized loss position, fair value	547,000
Unrealized loss position, gross unrealized loss	$ 0