Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016	Oct. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 30,369	$ 97,854	$ 123,316
Unrealized Gains	2	116	444
Unrealized (Losses)	(122)	(309)	(77)
Fair Value	30,249	97,661	123,683
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,668	61,043	69,541
Unrealized Gains	1	43	50
Unrealized (Losses)	(25)	(25)	(46)
Fair Value	24,644	61,061	69,545
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,701	36,811	53,775
Unrealized Gains	1	73	394
Unrealized (Losses)	(97)	(284)	(31)
Fair Value	5,605	36,600	54,138
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	7,160	44,360	61,523
Municipal And Pre-Refunded Municipal Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,859	26,243	31,100
Unrealized Gains		33	46
Unrealized (Losses)	(6)		(1)
Fair Value	6,853	26,276	31,145
Municipal And Pre-Refunded Municipal Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	307	18,028	30,265
Unrealized Gains		58	115
Unrealized (Losses)		(2)	(2)
Fair Value	307	18,084	30,378
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	18,014	46,071	52,408
Corporate Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,809	33,885	37,260
Unrealized Gains	1	10	4
Unrealized (Losses)	(19)	(25)	(45)
Fair Value	17,791	33,870	37,219
Corporate Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	222	12,227	15,210
Unrealized Gains	1	9	7
Unrealized (Losses)		(35)	(28)
Fair Value	223	12,201	15,189
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Fair Value	4,447	4,363	5,111
Mutual Funds, Held in Rabbi Trust \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,544	4,604	4,840
Unrealized Gains		6	272
Unrealized (Losses)	(97)	(247)	(1)
Fair Value	4,447	4,363	5,111
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value	628	2,867	4,641
Certificates of Deposit \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		915	1,181
Fair Value		915	1,181
Certificates of Deposit \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	628	1,952	3,460
Fair Value	$ 628	$ 1,952	$ 3,460

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
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-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
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-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
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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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