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Marketable Securities (Tables)

6 Months Ended

Jul. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Components of Marketable Securities

Marketable securities consist of the following for the periods presented (in thousands):

			July 31, 2024
			Cost or Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Total Estimated Fair Value
U.S. government securities			$	314,133					$	681					$	(491)					$	314,323
Foreign securities			6,346						19						(6)						6,359
Corporate debt securities			103,723						533						(38)						104,218
Total			$	424,202					$	1,233					$	(535)					$	424,900

			January 31, 2024
			Cost or Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Total Estimated Fair Value
U.S. government securities			$	319,343					$	782					$	(1,168)					$	318,957
Foreign securities			6,349						31						(13)						6,367
Corporate debt securities			82,368						340						(134)						82,574
Total			$	408,060					$	1,153					$	(1,315)					$	407,898

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value

The following table summarizes the fair value and gross unrealized losses aggregated by category of individual securities that have been in a continuous unrealized loss position for greater than 12 months (in thousands):

			July 31, 2024
			Continuous Unrealized Loss for Greater than 12 months
			Estimated Fair Value						Gross Unrealized Losses
U.S. government securities			$	106,926					$	(401)
Foreign securities			1,333						(3)
Corporate debt securities			11,905						(25)
Total			$	120,164					$	(429)

			January 31, 2024
			Continuous Unrealized Loss for Greater than 12 months
			Estimated Fair Value						Gross Unrealized Losses
U.S. government securities			$	99,613					$	(741)
Foreign securities			1,325						(11)
Corporate debt securities			28,858						(113)
Total			$	129,796					$	(865)

Schedule of Marketable Securities by Contractual Maturity

The contractual maturities of the investments classified as available-for-sale marketable securities are as follows (in thousands):

			July 31, 2024
			Amortized Cost						Estimated Fair Value
Due within 1 year			$	187,881					$	187,512
Due in 1 year through 5 years			236,321						237,388
Total			$	424,202					$	424,900

			January 31, 2024
			Amortized Cost						Estimated Fair Value
Due within 1 year			$	173,481					$	172,520
Due in 1 year through 5 years			234,579						235,378
Total			$	408,060					$	407,898

Schedule of Investment Income

The primary components of investment income from marketable securities were as follows (in thousands):

			Three Months Ended July 31,												Six Months Ended July 31,
			2024						2023						2024						2023
Interest income			$	4,455					$	3,245					$	8,615					$	6,173
Accretion/amortization of discount/premium, net			556						520						1,043						991
Investment income			$	5,011					$	3,765					$	9,658					$	7,164

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