Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019	Oct. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 253,142	$ 336,292	$ 274,604
Unrealized Gains	779	532
Unrealized (Losses)	(103)	(300)	(1,180)
Fair Value	253,818	336,524	273,424
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	170,371	279,426	237,916
Unrealized Gains	352	39
Unrealized (Losses)	(26)	(233)	(525)
Fair Value	170,697	279,232	237,391
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	125,040	227,287	200,910
Unrealized Gains	310	24
Unrealized (Losses)	(12)	(214)	(466)
Fair Value	125,338	227,097	200,444
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	39,256	43,677	33,291
Unrealized Gains	38	15
Unrealized (Losses)	(14)	(18)	(59)
Fair Value	39,280	43,674	33,232
Short-term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,622	1,458
Unrealized Gains	4
Fair Value	1,626	1,458
Short-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,466	1,050	755
Fair Value	2,466	1,050	755
Short-term Investments \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,987	2,979	2,960
Fair Value	1,987	2,979	2,960
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	82,771	56,866	36,688
Unrealized Gains	427	493
Unrealized (Losses)	(77)	(67)	(655)
Fair Value	83,121	57,292	36,033
Long Term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	45,556	34,265	24,793
Unrealized Gains	270	34
Unrealized (Losses)	(26)	(63)	(175)
Fair Value	45,800	34,236	24,618
Long Term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,795	7,554	2,573
Unrealized Gains	13	7
Unrealized (Losses)	(35)	(3)	(7)
Fair Value	20,773	7,558	2,566
Long Term Investments \| Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,365	6,603
Unrealized Gains		2
Unrealized (Losses)	(15)	(1)
Fair Value	6,350	6,604
Long Term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,394	2,143	2,390
Fair Value	2,394	2,143	2,390
Long Term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,661	6,301	6,932
Unrealized Gains	144	450
Unrealized (Losses)	(1)		(473)
Fair Value	$ 7,804	$ 6,751	$ 6,459

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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