Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 322,767	$ 336,292	$ 201,999
Unrealized Gains	420	532	33
Unrealized (Losses)	(130)	(300)	(586)
Fair Value	323,057	336,524	201,446
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	229,140	279,426	166,708
Unrealized Gains	99	39
Unrealized (Losses)	(76)	(233)	(341)
Fair Value	229,163	279,232	166,367
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	169,627	227,287	110,657
Unrealized Gains	72	24
Unrealized (Losses)	(70)	(214)	(294)
Fair Value	169,629	227,097	110,363
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	52,131	43,677	54,659
Unrealized Gains	23	15
Unrealized (Losses)	(6)	(18)	(47)
Fair Value	52,148	43,674	54,612
Short-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,735	1,458
Unrealized Gains	4
Fair Value	2,739	1,458
Short-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,650	1,050	1,392
Fair Value	1,650	1,050	1,392
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,997	2,979
Fair Value	2,997	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	93,627	56,866	35,291
Unrealized Gains	321	493	33
Unrealized (Losses)	(54)	(67)	(245)
Fair Value	93,894	57,292	35,079
Long Term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	71,105	34,265	18,137
Unrealized Gains	95	34
Unrealized (Losses)	(46)	(63)	(212)
Fair Value	71,154	34,236	17,925
Long Term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,035	7,554	7,873
Unrealized Gains	11	7
Unrealized (Losses)	(8)	(3)	(30)
Fair Value	11,038	7,558	7,843
Long Term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,351	6,603
Unrealized Gains	7	2
Unrealized (Losses)		(1)
Fair Value	2,358	6,604
Long Term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,403	2,143	2,828
Fair Value	1,403	2,143	2,828
Long Term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,733	6,301	6,453
Unrealized Gains	208	450	33
Unrealized (Losses)			(3)
Fair Value	$ 7,941	$ 6,751	$ 6,483

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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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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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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Amount 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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