Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jan. 31, 2021	Jan. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 298,635	$ 308,082
Unrealized Gains	52	618
Unrealized (Losses)	(330)	(151)
Fair Value	298,357	308,549
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	174,784	211,149
Unrealized Gains	12	341
Unrealized (Losses)	(101)	(37)
Fair Value	174,695	211,453
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	127,097	38,617
Unrealized Gains	11	20
Unrealized (Losses)	(53)	(11)
Fair Value	127,055	38,626
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,695	166,790
Unrealized Gains	1	318
Unrealized (Losses)	(48)	(26)
Fair Value	38,648	167,082
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,992	1,997
Fair Value	8,992	1,997
Short-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,152
Unrealized Gains		3
Fair Value		1,155
Short-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,593
Fair Value		2,593
Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	123,851	96,933
Unrealized Gains	40	277
Unrealized (Losses)	(229)	(114)
Fair Value	123,662	97,096
Long-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	53,134	30,340
Unrealized Gains	17	35
Unrealized (Losses)	(46)	(17)
Fair Value	53,105	30,358
Long-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	59,890	47,352
Unrealized Gains	3	205
Unrealized (Losses)	(129)	(40)
Fair Value	59,764	47,517
Long-term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,827	8,448
Unrealized Gains	20	36
Unrealized (Losses)	(54)	(55)
Fair Value	$ 10,793	8,429
Long-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		6,926
Unrealized Gains		1
Unrealized (Losses)		(2)
Fair Value		6,925
Long-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3,867
Fair Value		$ 3,867

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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