Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 224,005	$ 155,330
Unrealized Gains	293	170
Unrealized (Losses)	(485)	(145)
Fair Value	223,813	155,355
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	165,337	111,134
Unrealized Gains	11	35
Unrealized (Losses)	(223)	(102)
Fair Value	165,125	111,067
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	111,612	59,403
Unrealized Gains		7
Unrealized (Losses)	(184)	(90)
Fair Value	111,428	59,320
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	52,474	51,731
Unrealized Gains	11	28
Unrealized (Losses)	(39)	(12)
Fair Value	52,446	51,747
Short-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,251
Fair Value	1,251
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	58,668	44,196
Unrealized Gains	282	135
Unrealized (Losses)	(262)	(43)
Fair Value	58,688	44,288
Long Term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	39,853	19,102
Unrealized Gains		9
Unrealized (Losses)	(228)	(33)
Fair Value	39,625	19,078
Long Term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,873	19,488
Unrealized Gains	8	35
Unrealized (Losses)	(24)	(9)
Fair Value	9,857	19,514
Long Term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,969	1,023
Fair Value	2,969	1,023
Long Term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,973	4,583
Unrealized Gains	274	91
Unrealized (Losses)	(10)	(1)
Fair Value	$ 6,237	$ 4,673

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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