Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017	Oct. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 134,541	$ 155,330	$ 30,369
Unrealized Gains	117	170	2
Unrealized (Losses)	(176)	(145)	(122)
Fair Value	134,482	155,355	30,249
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	93,307	111,134	24,668
Unrealized Gains	6	35	1
Unrealized (Losses)	(85)	(102)	(25)
Fair Value	93,228	111,067	24,644
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	67,275	59,403	17,809
Unrealized Gains	2	7	1
Unrealized (Losses)	(71)	(90)	(19)
Fair Value	67,206	59,320	17,791
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,676	51,731	6,859
Unrealized Gains	4	28
Unrealized (Losses)	(14)	(12)	(6)
Fair Value	24,666	51,747	6,853
Short-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,356
Fair Value	1,356
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	41,234	44,196	5,701
Unrealized Gains	111	135	1
Unrealized (Losses)	(91)	(43)	(97)
Fair Value	41,254	44,288	5,605
Long Term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,051	19,102	222
Unrealized Gains	2	9	1
Unrealized (Losses)	(87)	(33)
Fair Value	29,966	19,078	223
Long Term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,362	19,488	307
Unrealized Gains		35
Unrealized (Losses)	(2)	(9)
Fair Value	1,360	19,514	307
Long Term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,182	1,023	628
Fair Value	4,182	1,023	628
Long Term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,639	4,583	4,544
Unrealized Gains	109	91
Unrealized (Losses)	(2)	(1)	(97)
Fair Value	$ 5,746	$ 4,673	$ 4,447

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
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=82896770&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
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-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
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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
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