Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 308,082	$ 336,292
Unrealized Gains	618	532
Unrealized (Losses)	(151)	(300)
Fair Value	308,549	336,524
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	211,149	279,426
Unrealized Gains	341	39
Unrealized (Losses)	(37)	(233)
Fair Value	211,453	279,232
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	166,790	227,287
Unrealized Gains	318	24
Unrealized (Losses)	(26)	(214)
Fair Value	167,082	227,097
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,617	43,677
Unrealized Gains	20	15
Unrealized (Losses)	(11)	(18)
Fair Value	38,626	43,674
Short-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,152	1,458
Unrealized Gains	3
Fair Value	1,155	1,458
Short-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,593	1,050
Fair Value	2,593	1,050
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,997	2,979
Fair Value	1,997	2,979
Short-term Investments \| Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,975
Unrealized (Losses)		(1)
Fair Value		2,974
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	96,933	56,866
Unrealized Gains	277	493
Unrealized (Losses)	(114)	(67)
Fair Value	97,096	57,292
Long Term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	47,352	34,265
Unrealized Gains	205	34
Unrealized (Losses)	(40)	(63)
Fair Value	47,517	34,236
Long Term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,340	7,554
Unrealized Gains	35	7
Unrealized (Losses)	(17)	(3)
Fair Value	30,358	7,558
Long Term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,926	6,603
Unrealized Gains	1	2
Unrealized (Losses)	(2)	(1)
Fair Value	6,925	6,604
Long Term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,867	2,143
Fair Value	3,867	2,143
Long Term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,448	6,301
Unrealized Gains	36	450
Unrealized (Losses)	(55)
Fair Value	$ 8,429	$ 6,751

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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