Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jul. 31, 2021	Jan. 31, 2021	Jul. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 270,402	$ 298,635	$ 9,351
Unrealized Gains	197	52	366
Unrealized (Losses)	(368)	(330)
Fair Value	270,231	298,357	9,717
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	157,077	174,784	501
Unrealized Gains	16	12
Unrealized (Losses)	(111)	(101)
Fair Value	156,982	174,695	501
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	28,808	38,695	291
Unrealized Gains	2	1
Unrealized (Losses)	(24)	(48)
Fair Value	28,786	38,648	291
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	122,173	127,097	210
Unrealized Gains	14	11
Unrealized (Losses)	(87)	(53)
Fair Value	122,100	127,055	210
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,096	8,992
Fair Value	6,096	8,992
Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	113,325	123,851	8,850
Unrealized Gains	181	40	366
Unrealized (Losses)	(257)	(229)
Fair Value	113,249	123,662	9,216
Long-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	61,646	59,890	30
Unrealized Gains	4	3
Unrealized (Losses)	(159)	(129)
Fair Value	61,491	59,764	30
Long-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,069	53,134	53
Unrealized Gains	34	17	1
Unrealized (Losses)	(56)	(46)
Fair Value	40,047	53,105	54
Long-term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,610	10,827	8,767
Unrealized Gains	143	20	365
Unrealized (Losses)	(42)	(54)
Fair Value	$ 11,711	$ 10,793	$ 9,132

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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