Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jul. 31, 2020	Jan. 31, 2020	Jul. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 9,351	$ 308,082	$ 249,916
Unrealized Gains	366	618	469
Unrealized (Losses)		(151)	(130)
Fair Value	9,717	308,549	250,255
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	501	211,149	171,206
Unrealized Gains		341	232
Unrealized (Losses)		(37)	(40)
Fair Value	501	211,453	171,398
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	291	166,790	125,943
Unrealized Gains		318	190
Unrealized (Losses)		(26)	(31)
Fair Value	291	167,082	126,102
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	210	38,617	42,023
Unrealized Gains		20	40
Unrealized (Losses)		(11)	(9)
Fair Value	210	38,626	42,054
Short-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,593	1,745
Fair Value		2,593	1,745
Short-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,152	1,495
Unrealized Gains		3	2
Fair Value		1,155	1,497
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,997
Fair Value		1,997
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,850	96,933	78,710
Unrealized Gains	366	277	237
Unrealized (Losses)		(114)	(90)
Fair Value	9,216	97,096	78,857
Long Term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30	47,352	49,385
Unrealized Gains		205	174
Unrealized (Losses)		(40)	(33)
Fair Value	30	47,517	49,526
Long Term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	53	30,340	19,526
Unrealized Gains	1	35	6
Unrealized (Losses)		(17)	(50)
Fair Value	54	30,358	19,482
Long Term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,767	8,448	7,826
Unrealized Gains	365	36	56
Unrealized (Losses)		(55)	(7)
Fair Value	$ 9,132	8,429	7,875
Long Term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3,867	1,847
Fair Value		3,867	1,847
Long Term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		6,926	126
Unrealized Gains		1	1
Unrealized (Losses)		(2)
Fair Value		$ 6,925	$ 127

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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