Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021	Apr. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 264,940	$ 298,635	$ 77,704
Unrealized Gains	462	52	732
Unrealized (Losses)	(292)	(330)	(43)
Fair Value	265,110	298,357	78,393
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	164,557	174,784	65,133
Unrealized Gains	6	12	26
Unrealized (Losses)	(133)	(101)	(38)
Fair Value	164,430	174,695	65,121
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48,500	38,695	14,246
Unrealized Gains	1	1	21
Unrealized (Losses)	(49)	(48)	(7)
Fair Value	48,452	38,648	14,260
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	106,266	127,097	50,887
Unrealized Gains	5	11	5
Unrealized (Losses)	(84)	(53)	(31)
Fair Value	106,187	127,055	50,861
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,791	8,992
Fair Value	9,791	8,992
Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	100,383	123,851	12,571
Unrealized Gains	456	40	706
Unrealized (Losses)	(159)	(229)	(5)
Fair Value	100,680	123,662	13,272
Long-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48,850	59,890	2,572
Unrealized Gains	2	3	3
Unrealized (Losses)	(111)	(129)	(4)
Fair Value	48,741	59,764	2,571
Long-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,085	53,134	2,350
Unrealized Gains	17	17	21
Unrealized (Losses)	(48)	(46)	(1)
Fair Value	40,054	53,105	2,370
Long-term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,448	10,827	7,400
Unrealized Gains	437	20	682
Unrealized (Losses)		(54)
Fair Value	$ 11,885	$ 10,793	8,082
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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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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