Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Apr. 30, 2022	Jan. 31, 2022	Apr. 30, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 376,695	$ 467,532	$ 264,940
Unrealized Gains		3	462
Unrealized (Losses)	(9,674)	(4,558)	(292)
Fair Value	367,021	462,977	265,110
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	189,146	239,929	164,557
Unrealized Gains		2	6
Unrealized (Losses)	(1,583)	(511)	(133)
Fair Value	187,563	239,420	164,430
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	85,474	85,062	48,500
Unrealized Gains		1	1
Unrealized (Losses)	(857)	(200)	(49)
Fair Value	84,617	84,863	48,452
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	86,134	128,984	106,266
Unrealized Gains		1	5
Unrealized (Losses)	(633)	(273)	(84)
Fair Value	85,501	128,712	106,187
Short-term Investments \| US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,749	14,999
Unrealized (Losses)	(93)	(38)
Fair Value	9,656	14,961
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,789	10,884	9,791
Fair Value	7,789	10,884	9,791
Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	187,549	227,603	100,383
Unrealized Gains		1	456
Unrealized (Losses)	(8,091)	(4,047)	(159)
Fair Value	179,458	223,557	100,680
Long-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	117,403	148,830	48,850
Unrealized Gains			2
Unrealized (Losses)	(4,904)	(2,478)	(111)
Fair Value	112,499	146,352	48,741
Long-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	53,928	60,533	40,085
Unrealized Gains		1	17
Unrealized (Losses)	(2,081)	(912)	(48)
Fair Value	51,847	59,622	40,054
Long-term Investments \| US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,226	5,222
Unrealized (Losses)	(138)	(46)
Fair Value	3,088	5,176
Long-term Investments \| Mutual Fund
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,393	12,419	11,448
Unrealized Gains			437
Unrealized (Losses)	(956)	(606)
Fair Value	11,437	11,813	$ 11,885
Long-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	350	350
Unrealized (Losses)	(12)	(5)
Fair Value	338	345
Long-term Investments \| Certificates of Deposit
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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