Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Schedule Of Financial Assets Measured At Fair Value on A Recurring Basis

The Company’s financial assets measured at fair value on a recurring basis subject to the disclosure requirements at September 30, 2020, were as follows (in thousands):

	Fair Value Measurements at Reporting Date Using						Fair Value at September 30, 2020
	Quoted Prices in Active Markets for Identical Securities (Level  1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents	$	43,553	$	207,417	$	—	$	250,970
Short-term investments
Available-for-sale securities — corporate bonds and notes	—		189,662		—		189,662
Available-for-sale securities — municipal bonds and notes	—		6,146		—		6,146
Available-for-sale securities — U.S. government securities	—		117,374		—		117,374
Available-for-sale securities — U.S. government agency securities	—		47,151		—		47,151
Long-term investments
Available-for-sale securities — corporate bonds and notes	—		102,939		—		102,939
Total	$	43,553	$	670,689	$	—	$	714,242

The Company’s financial assets measured at fair value on a recurring basis subject to the disclosure requirements at September 30, 2019, were as follows (in thousands):

	Fair Value Measurements at Reporting Date Using						Fair Value at September 30, 2019
	Quoted Prices in Active Markets for Identical Securities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents	$	140,238	$	153,404	$	—	$	293,642
Short-term investments
Available-for-sale securities — certificates of deposit	—		249		—		249
Available-for-sale securities — corporate bonds and notes	—		259,547		—		259,547
Available-for-sale securities — municipal bonds and notes	—		12,129		—		12,129
Available-for-sale securities — U.S. government securities	—		78,992		—		78,992
Available-for-sale securities — U.S. government agency securities	—		22,146		—		22,146
Long-term investments
Available-for-sale securities — corporate bonds and notes	—		298,916		—		298,916
Available-for-sale securities — municipal bonds and notes	—		2,524		—		2,524
Available-for-sale securities — U.S. government securities	—		5,515		—		5,515
Available-for-sale securities — U.S. government agency securities	—		51,447		—		51,447
Total	$	140,238	$	884,869	$	—	$	1,025,107