Investments (Tables)

3 Months Ended

Dec. 31, 2020

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 December 31, 2020 and September 30, 2020 by measurement category.

Held to Maturity	As of December 31, 2020
	(In thousands)
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial notes (due within one year)	$	79,394	$	1,203	$	-		$	80,597
Commercial notes (due within one through three years)	$	110,855	$	3,634	$	(23	)	$	114,466
Total	$	190,249	$	4,837	$	(23	)	$	195,063
	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 December 31, 2020
	(In thousands)
	Cost		Realized Gains/(Losses)		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Marketable securities	$	85,095	$	477	$	440	$	-		$	86,012
Total	$	85,095	$	477	$	440	$	-		$	86,012
	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