Marketable Securities - Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jan. 31, 2023	Jan. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 291,726	$ 467,532
Unrealized Gains	41	3
Unrealized (Losses)	(7,545)	(4,558)
Fair Value	284,222	462,977
Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	108,703	227,603
Unrealized Gains	40	1
Unrealized (Losses)	(5,899)	(4,047)
Fair Value	102,844	223,557
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	183,023	239,929
Unrealized Gains	1	2
Unrealized (Losses)	(1,646)	(511)
Fair Value	181,378	239,420
Municipal And Pre-Refunded Municipal Bonds \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,437	60,533
Unrealized Gains	5	1
Unrealized (Losses)	(1,154)	(912)
Fair Value	22,288	59,622
Municipal And Pre-Refunded Municipal Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48,141	128,984
Unrealized Gains	0	1
Unrealized (Losses)	(688)	(273)
Fair Value	47,453	128,712
Corporate Bonds \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	62,594	148,830
Unrealized Gains	22
Unrealized (Losses)	(3,319)	(2,478)
Fair Value	59,297	146,352
Corporate Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	83,184	85,062
Unrealized Gains	0	1
Unrealized (Losses)	(947)	(200)
Fair Value	82,237	84,863
US Treasury Securities \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		5,222
Unrealized (Losses)		(46)
Fair Value		5,176
US Treasury Securities \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,561	14,999
Unrealized Gains	1
Unrealized (Losses)	(10)	(38)
Fair Value	23,552	14,961
Commercial Paper \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,636	10,884
Unrealized (Losses)		0
Fair Value	21,636	10,884
Mutual Funds, Held in Rabbi Trust \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,402	12,419
Unrealized Gains
Unrealized (Losses)	(1,424)	(606)
Fair Value	11,978	11,813
Federal Government Agencies \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,021	350
Unrealized Gains	13
Unrealized (Losses)	(2)	(5)
Fair Value	9,032	345
Federal Government Agencies \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,501
Unrealized (Losses)	(1)
Fair Value	6,500
Certificates of Deposit \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	249	249
Fair Value	$ 249	$ 249

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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

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