Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017	Apr. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 156,932	$ 155,330	$ 78,213
Unrealized Gains	110	170	84
Unrealized (Losses)	(98)	(145)	(23)
Fair Value	156,944	155,355	78,274
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	118,526	111,134	59,541
Unrealized Gains	28	35	32
Unrealized (Losses)	(61)	(102)	(9)
Fair Value	118,493	111,067	59,564
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,406	44,196	18,672
Unrealized Gains	82	135	52
Unrealized (Losses)	(37)	(43)	(14)
Fair Value	38,451	44,288	18,710
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	104,812	78,398	24,318
Corporate Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	77,313	59,403	18,972
Unrealized Gains	4	7	5
Unrealized (Losses)	(58)	(90)	(7)
Fair Value	77,259	59,320	18,970
Corporate Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,586	19,102	5,356
Unrealized Gains	3	9	2
Unrealized (Losses)	(36)	(33)	(10)
Fair Value	27,553	19,078	5,348
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	45,584	71,261	49,673
Municipal And Pre-Refunded Municipal Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,788	51,731	40,569
Unrealized Gains	24	28	27
Unrealized (Losses)	(3)	(12)	(2)
Fair Value	40,809	51,747	40,594
Municipal And Pre-Refunded Municipal Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,758	19,488	9,060
Unrealized Gains	17	35	20
Unrealized (Losses)		(9)	(1)
Fair Value	4,775	19,514	9,079
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Fair Value	5,072	4,673	3,934
Mutual Funds, Held in Rabbi Trust \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,011	4,583	3,907
Unrealized Gains	62	91	30
Unrealized (Losses)	(1)	(1)	(3)
Fair Value	5,072	4,673	3,934
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,476	1,023	349
Certificates of Deposit \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	425
Fair Value	425
Certificates of Deposit \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,051	1,023	349
Fair Value	$ 1,051	$ 1,023	$ 349

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=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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Amount before tax of unrealized gain 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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