Fair Value Measurements (Tables)

9 Months Ended

Jun. 30, 2019

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 June 30, 2019, were as follows (in thousands):

	Fair Value Measurements at Reporting Date Using
	Quoted Prices in Active Markets for Identical Securities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at June 30, 2019
Cash equivalents	$	48,807	$	228,127	$	—	$	276,934
Short-term investments
Available-for-sale securities — certificates of deposits	—		734		—		734
Available-for-sale securities — corporate bonds and notes	—		256,422		—		256,422
Available-for-sale securities — municipal bonds and notes	—		13,054		—		13,054
Available-for-sale securities — U.S. government securities	—		25,929		—		25,929
Available-for-sale securities — U.S. government agency securities	—		1,998		—		1,998
Long-term investments
Available-for-sale securities — corporate bonds and notes	—		155,348		—		155,348
Available-for-sale securities — municipal bonds and notes	—		3,776		—		3,776
Available-for-sale securities — U.S. government agency securities	—		2,495		—		2,495
Total	$	48,807	$	687,883	$	—	$	736,690

The Company’s financial assets measured at fair value on a recurring basis subject to the disclosure requirements at September 30, 2018, were as follows (in thousands):

	Fair Value Measurements at Reporting Date Using
	Quoted Prices in Active Markets for Identical Securities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at September 30, 2018
Cash equivalents	$	41,468	$	13,118	$	—	$	54,586
Short-term investments
Available-for-sale securities — certificates of deposits	—		2,970		—		2,970
Available-for-sale securities — corporate bonds and notes	—		393,750		—		393,750
Available-for-sale securities — municipal bonds and notes	—		22,524		—		22,524
Available-for-sale securities — U.S. government securities	—		120,078		—		120,078
Available-for-sale securities — U.S. government agency securities	—		75,383		—		75,383
Long-term investments
Available-for-sale securities — corporate bonds and notes	—		367,710		—		367,710
Available-for-sale securities — municipal bonds and notes	—		24,286		—		24,286
Available-for-sale securities — U.S. government securities	—		12,771		—		12,771
Available-for-sale securities — U.S. government agency securities	—		6,417		—		6,417
Total	$	41,468	$	1,039,007	$	—	$	1,080,475