Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Assets Measured at Fair Value on Recurring Basis

Assets measured at fair value on a recurring basis by level of the fair value hierarchy were as follows:

	March 31, 2021
(In thousands)	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value
Assets
Cash equivalents	$	—	$	31,135	$	—	$	31,135
Available-for-sale securities		—		21,863		—		21,863
Total assets	$	—	$	52,998	$	—	$	52,998

	September 30, 2020
(In thousands)	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value
Assets
Cash equivalents	$	—	$	18,634	$	—	$	18,634
Available-for-sale securities		—		30,313		—	$	30,313
Total assets	$	—	$	48,947	$	—	$	48,947