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Short-Term and Long-Term Investments (Tables)

3 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of Short-Term and Long-Term Investments

Short-term investments consist of the following (in thousands):

December 31, 2021						Cost or Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Certificates of deposits						$	992					$	—					$	—					$	992
Corporate bonds and notes						177,248						10						(165)						177,093
Municipal bonds and notes						15,377						—						(18)						15,359
U.S. government securities						136,091						—						(157)						135,934
U.S. government agency securities						17,193						—						(23)						17,170
						$	346,901					$	10					$	(363)					$	346,548

September 30, 2021						Cost or Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Certificates of deposits						$	255					$	—					$	—					$	255
Corporate bonds and notes						186,043						116						(52)						186,107
Municipal bonds and notes						13,570						1						(5)						13,566
U.S. government securities						102,607						12						(4)						102,615
U.S. government agency securities						27,096						—						(9)						27,087
						$	329,571					$	129					$	(70)					$	329,630

Long-term investments consist of the following (in thousands):

December 31, 2021						Cost or Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Corporate bonds and notes						$	48,845					$	—					$	(207)					$	48,638
Municipal bonds and notes						2,262						—						(23)						2,239
U.S. government securities						24,426						—						(85)						24,341
U.S. government agency securities						1,783						—						(10)						1,773
						$	77,316					$	—					$	(325)					$	76,991

September 30, 2021						Cost or Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Corporate bonds and notes						$	53,128					$	13					$	(34)					$	53,107
Municipal bonds and notes						11,114						1						(4)						11,111
U.S. government securities						59,614						2						(8)						59,608
U.S. government agency securities						8,957						—						(5)						8,952
						$	132,813					$	16					$	(51)					$	132,778

Schedule of Investments That Have Been in a Continuous Unrealized Loss Position

The following table summarizes investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for more than 12 months as of December 31, 2021 (in thousands):

						Less Than 12 Months												12 Months or Greater												Total
December 31, 2021						Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses
Corporate bonds and notes						$	196,228					$	(372)					$	—					$	—					$	196,228					$	(372)
Municipal bonds and notes						16,144						(41)						—						—						16,144						(41)
U.S. government securities						160,275						(242)						—						—						160,275						(242)
U.S. government agency securities						18,943						(33)						—						—						18,943						(33)
Total						$	391,590					$	(688)					$	—					$	—					$	391,590					$	(688)

The following table summarizes investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for more than 12 months as of September 30, 2021 (in thousands):

						Less Than 12 Months												12 Months or Greater												Total
September 30, 2021						Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses
Corporate bonds and notes						$	151,986					$	(86)					$	—					$	—					$	151,986					$	(86)
Municipal bonds and notes						13,764						(9)						—						—						13,764						(9)
U.S. government securities						77,401						(12)						—						—						77,401						(12)
U.S. government agency securities						31,384						(14)						—						—						31,384						(14)
Total						$	274,535					$	(121)					$	—					$	—					$	274,535					$	(121)

X

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-URI http://asc.fasb.org/topic&trid=2196928

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- Definition

For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563

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