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Investments (Tables)

6 Months Ended

Mar. 31, 2021

Held To Maturity Securities Classified [Abstract]

Summary of Short-term and Long-term Investments and Marketable Securities

The following tables summarize the Company’s short-term and long-term investments and marketable securities as of March 31, 2021 and September 30, 2020 by measurement category.

Held to Maturity		As of March 31, 2021
		(In thousands)
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
Commercial notes (due within one year)		$	79,148			$	887			$	-			$	80,035
Commercial notes (due within one through three years)		$	97,490			$	2,655			$	(66	)		$	100,079
Total		$	176,638			$	3,542			$	(66	)		$	180,114

		As of September 30, 2020
		(In thousands)
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
Commercial notes (due within one year)		$	86,890			$	1,590			$	-			$	88,480
Commercial notes (due within one through three years)		$	137,487			$	4,573			$	(79	)		$	141,981
Total		$	224,377			$	6,163			$	(79	)		$	230,461

Fair Value		As of March 31, 2021
		(In thousands)
		Cost				Realized Gains/(Losses)				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
Marketable securities		$	125,000			$	1,079			$	205			$	(491	)		$	125,793
Total		$	125,000			$	1,079			$	205			$	(491	)		$	125,793

		As of September 30, 2020
		(In thousands)
		Cost				Realized Gains/(Losses)				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
Marketable securities		$	85,000			$	95			$	-			$	(75	)		$	85,020
Total		$	85,000			$	95			$	-			$	(75	)		$	85,020