Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020	Oct. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 9,478	$ 308,082	$ 253,142
Unrealized Gains	18	618	779
Unrealized (Losses)	(144)	(151)	(103)
Fair Value	9,352	308,549	253,818
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2	211,149	170,371
Unrealized Gains		341	352
Unrealized (Losses)		(37)	(26)
Fair Value	2	211,453	170,697
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2	166,790	125,040
Unrealized Gains		318	310
Unrealized (Losses)		(26)	(12)
Fair Value	2	167,082	125,338
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		38,617	39,256
Unrealized Gains		20	38
Unrealized (Losses)		(11)	(14)
Fair Value		38,626	39,280
Short-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,593	2,466
Fair Value		2,593	2,466
Short-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,152	1,622
Unrealized Gains		3	4
Fair Value		1,155	1,626
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,997	1,987
Fair Value		1,997	1,987
Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,476	96,933	82,771
Unrealized Gains	18	277	427
Unrealized (Losses)	(144)	(114)	(77)
Fair Value	9,350	97,096	83,121
Long-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30	47,352	45,556
Unrealized Gains		205	270
Unrealized (Losses)		(40)	(26)
Fair Value	30	47,517	45,800
Long-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	53	30,340	20,795
Unrealized Gains	1	35	13
Unrealized (Losses)		(17)	(35)
Fair Value	54	30,358	20,773
Long-term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,393	8,448	7,661
Unrealized Gains	17	36	144
Unrealized (Losses)	(144)	(55)	(1)
Fair Value	$ 9,266	8,429	7,804
Long-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3,867	2,394
Fair Value		3,867	2,394
Long-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		6,926	6,365
Unrealized Gains		1
Unrealized (Losses)		(2)	(15)
Fair Value		$ 6,925	$ 6,350

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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