Employee Benefits and Stock-based Compensation (Tables)

12 Months Ended

Jan. 31, 2025

Postemployment Benefits [Abstract]

Classification of Stock-based Compensation

The following table presents the classification of stock-based compensation for the periods indicated:

	Year Ended January 31,
	2025		2024		2023
	(in thousands)
Stock-based compensation:
Cost of revenue	$	3,270	$	3,341	$	3,597
Research and development		73,025		72,759		71,236
Selling, general and administrative		31,748		35,216		36,325
Total stock-based compensation	$	108,043	$	111,316	$	111,158

Weighted-Average Assumptions Used to Estimate Fair Value

The following table sets forth the weighted-average assumptions used to estimate the fair value of employee stock purchase plan awards for the periods indicated:

	Year Ended January 31,
	2025			2024			2023
Employee stock purchase plan awards:
Volatility		47	%		56	%		81	%
Risk-free interest rate		4.97	%		5.11	%		2.32	%
Expected term (years)		0.5			0.5			0.5
Dividend yield		0	%		0	%		0	%

Stock Option Activities

The following table summarizes stock option activities for the periods indicated:

	Option Outstanding
										Weighted-
								Total Intrinsic		Average
						Weighted-	Weighted-	Value of		Remaining	Aggregate
				Weighted-		Average	Average	options		Contractual	Intrinsic
				Average		Grant-date	Acquisition-date	Exercised		Term	Value
	Shares			Exercise Price		Fair Value	Fair Value	(in thousands)		(in years)	(in thousands)
Outstanding at January 31, 2022		619,322		$	40.08
Exercised		(121,624	)		30.34			$	6,712
Forfeited		(10,618	)		55.97
Expired		(2,289	)		39.19
Outstanding at January 31, 2023		484,791			42.18
Exercised		(104,931	)		26.06			$	4,479
Forfeited		(926	)		42.59
Expired		(5,616	)		63.39
Outstanding at January 31, 2024		373,318			46.39
Exercised		(144,519	)		36.90			$	3,128
Forfeited		(71	)		102.29
Expired		(2,112	)		70.63
Outstanding at January 31, 2025		226,616			52.20					3.03	$	5,936
Exercisable at January 31, 2025		214,708		$	53.42					2.88	$	5,379

Restricted Stock Unit Activities

The following table summarizes restricted stock unit activities for the periods indicated:

				Weighted-
				Average
				Grant-Date
	Shares			Fair Value
Unvested at January 31, 2022		2,651,135		$	85.41
Granted		1,549,174			74.45
Vested		(1,513,972	)		71.32
Forfeited		(112,978	)		99.46
Unvested at January 31, 2023		2,573,359			86.81
Granted		1,305,401			70.32
Vested		(1,220,608	)		78.62
Forfeited		(225,512	)		81.79
Unvested at January 31, 2024		2,432,640			82.54
Granted		1,478,425			62.40
Vested		(1,106,546	)		76.43
Forfeited		(159,140	)		115.67
Unvested at January 31, 2025		2,645,379		$	71.84