Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017	Jul. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 136,122	$ 155,330	$ 85,028
Unrealized Gains	131	170	241
Unrealized (Losses)	(98)	(145)	(38)
Fair Value	136,155	155,355	85,231
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	110,250	111,134	59,208
Unrealized Gains	19	35	51
Unrealized (Losses)	(74)	(102)	(28)
Fair Value	110,195	111,067	59,231
Short-term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	72,805	59,403	23,658
Unrealized Gains	4	7	8
Unrealized (Losses)	(61)	(90)	(24)
Fair Value	72,748	59,320	23,642
Short-term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,630	51,731	34,720
Unrealized Gains	15	28	43
Unrealized (Losses)	(13)	(12)	(4)
Fair Value	36,632	51,747	34,759
Short-term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	815		830
Fair Value	815		830
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25,872	44,196	25,820
Unrealized Gains	112	135	190
Unrealized (Losses)	(24)	(43)	(10)
Fair Value	25,960	44,288	26,000
Long Term Investments \| Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,906	19,102	8,958
Unrealized Gains		9	8
Unrealized (Losses)	(22)	(33)	(9)
Fair Value	14,884	19,078	8,957
Long Term Investments \| Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,057	19,488	12,191
Unrealized Gains	9	35	29
Unrealized (Losses)	(2)	(9)	(1)
Fair Value	3,064	19,514	12,219
Long Term Investments \| Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,726	1,023	515
Fair Value	2,726	1,023	515
Long Term Investments \| Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,183	4,583	4,156
Unrealized Gains	103	91	153
Unrealized (Losses)		(1)
Fair Value	$ 5,286	$ 4,673	$ 4,309

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
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