Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020	Apr. 30, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 77,704	$ 308,082	$ 322,767
Unrealized Gains	732	618	420
Unrealized (Losses)	(43)	(151)	(130)
Fair Value	78,393	308,549	323,057
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	65,133	211,149	229,140
Unrealized Gains	26	341	99
Unrealized (Losses)	(38)	(37)	(76)
Fair Value	65,121	211,453	229,163
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,246	166,790	169,627
Unrealized Gains	21	318	72
Unrealized (Losses)	(7)	(26)	(70)
Fair Value	14,260	167,082	169,629
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	50,887	38,617	52,131
Unrealized Gains	5	20	23
Unrealized (Losses)	(31)	(11)	(6)
Fair Value	50,861	38,626	52,148
Short-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,593	1,650
Fair Value		2,593	1,650
Short-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,152	2,735
Unrealized Gains		3	4
Fair Value		1,155	2,739
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,997	2,997
Fair Value		1,997	2,997
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,571	96,933	93,627
Unrealized Gains	706	277	321
Unrealized (Losses)	(5)	(114)	(54)
Fair Value	13,272	97,096	93,894
Long Term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,572	47,352	71,105
Unrealized Gains	3	205	95
Unrealized (Losses)	(4)	(40)	(46)
Fair Value	2,571	47,517	71,154
Long Term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,350	30,340	11,035
Unrealized Gains	21	35	11
Unrealized (Losses)	(1)	(17)	(8)
Fair Value	2,370	30,358	11,038
Long Term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,400	8,448	7,733
Unrealized Gains	682	36	208
Unrealized (Losses)		(55)
Fair Value	8,082	8,429	7,941
Long Term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	249	3,867	1,403
Fair Value	$ 249	3,867	1,403
Long Term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		6,926	2,351
Unrealized Gains		1	7
Unrealized (Losses)		(2)
Fair Value		$ 6,925	$ 2,358

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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Amount, before tax, of unrealized loss 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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