Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021	Oct. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 459,236	$ 298,635	$ 9,478
Unrealized Gains	563	52	18
Unrealized (Losses)	(1,644)	(330)	(144)
Fair Value	458,155	298,357	9,352
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	188,510	174,784	2
Unrealized Gains	12	12
Unrealized (Losses)	(147)	(101)
Fair Value	188,375	174,695	2
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	53,744	38,695	2
Unrealized Gains	3	1
Unrealized (Losses)	(71)	(48)
Fair Value	53,676	38,648	2
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	114,818	127,097
Unrealized Gains	9	11
Unrealized (Losses)	(73)	(53)
Fair Value	114,754	127,055
Short-term Investments \| Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,849
Unrealized (Losses)	(3)
Fair Value	16,846
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,099	8,992
Fair Value	3,099	8,992
Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	270,726	123,851	9,476
Unrealized Gains	551	40	18
Unrealized (Losses)	(1,497)	(229)	(144)
Fair Value	269,780	123,662	9,350
Long-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	174,884	59,890	30
Unrealized Gains	1	3
Unrealized (Losses)	(1,125)	(129)
Fair Value	173,760	59,764	30
Long-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	78,955	53,134	53
Unrealized Gains	8	17	1
Unrealized (Losses)	(362)	(46)
Fair Value	78,601	53,105	54
Long-term Investments \| Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,748
Unrealized (Losses)	(7)
Fair Value	4,741
Long-term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,540	10,827	9,393
Unrealized Gains	542	20	17
Unrealized (Losses)	(1)	(54)	(144)
Fair Value	12,081	$ 10,793	$ 9,266
Long-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	350
Unrealized (Losses)	(2)
Fair Value	348
Long-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	249
Fair Value	$ 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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