Marketable Securities - Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Apr. 30, 2023	Jan. 31, 2023	Apr. 30, 2022
Schedule of Available-for-sale Securities [Line Items]
Short-term Investments, Fair Value	$ 209,777	$ 181,378	$ 187,563
Long-term Investments, Fair Value	86,156	102,844	179,458
Amortized Cost	300,719	291,726	376,695
Unrealized Gains	165	41	0
Unrealized (Losses)	(4,951)	(7,545)	(9,674)
Fair Value	295,933	284,222	367,021
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	211,580	183,023	189,146
Unrealized Gains	2	1	0
Unrealized (Losses)	(1,805)	(1,646)	(1,583)
Fair Value	209,777	181,378	187,563
Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	89,139	108,703	187,549
Unrealized Gains	163	40	0
Unrealized (Losses)	(3,146)	(5,899)	(8,091)
Fair Value	86,156	102,844	179,458
Corporate Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	86,052	83,184	85,474
Unrealized Gains	1
Unrealized (Losses)	(1,214)	(947)	(857)
Fair Value	84,839	82,237	84,617
Corporate Bonds \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,823	62,594	117,403
Unrealized Gains	17	22
Unrealized (Losses)	(2,141)	(3,319)	(4,904)
Fair Value	40,699	59,297	112,499
Municipal and Pre-Refunded Municipal Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	45,467	48,141	86,134
Unrealized Gains
Unrealized (Losses)	(547)	(688)	(633)
Fair Value	44,920	47,453	85,501
Municipal and Pre-Refunded Municipal Bonds \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,071	23,437	53,928
Unrealized Gains	5	5
Unrealized (Losses)	(906)	(1,154)	(2,081)
Fair Value	18,170	22,288	51,847
Commercial Paper \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,874	21,636	7,789
Unrealized Gains
Unrealized (Losses)
Fair Value	35,874	21,636	7,789
US Treasury Securities \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,903	23,561	9,749
Unrealized Gains	1	1
Unrealized (Losses)	(16)	(10)	(93)
Fair Value	22,888	23,552	9,656
US Treasury Securities \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			3,226
Unrealized Gains
Unrealized (Losses)			(138)
Fair Value			3,088
Federal Government Agencies \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,284	6,501
Unrealized Gains
Unrealized (Losses)	(28)	(1)
Fair Value	21,256	6,500
Federal Government Agencies \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,340	9,021	350
Unrealized Gains	9	13
Unrealized (Losses)	(37)	(2)	(12)
Fair Value	14,312	9,032	338
Mutual Funds, Held in Rabbi Trust \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,656	13,402	12,393
Unrealized Gains	132
Unrealized (Losses)	(62)	(1,424)	(956)
Fair Value	12,726	11,978	11,437
Certificates of Deposit \| Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	249	249	249
Unrealized Gains
Unrealized (Losses)
Fair Value	$ 249	$ 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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