Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016	Jul. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 85,028	$ 97,854	$ 144,583
Unrealized Gains	241	116	221
Unrealized (Losses)	(38)	(309)	(114)
Fair Value	85,231	97,661	144,690
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	59,208	61,043	71,943
Unrealized Gains	51	43	44
Unrealized (Losses)	(28)	(25)	(61)
Fair Value	59,231	61,061	71,926
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25,820	36,811	72,640
Unrealized Gains	190	73	177
Unrealized (Losses)	(10)	(284)	(53)
Fair Value	26,000	36,600	72,764
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	46,978	44,360	77,534
Municipal And Pre-Refunded Municipal Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	34,720	26,243	31,983
Unrealized Gains	43	33	43
Unrealized (Losses)	(4)		(1)
Fair Value	34,759	26,276	32,025
Municipal And Pre-Refunded Municipal Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,191	18,028	45,405
Unrealized Gains	29	58	110
Unrealized (Losses)	(1)	(2)	(6)
Fair Value	12,219	18,084	45,509
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	32,599	46,071	55,699
Corporate Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,658	33,885	37,961
Unrealized Gains	8	10	1
Unrealized (Losses)	(24)	(25)	(60)
Fair Value	23,642	33,870	37,902
Corporate Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,958	12,227	17,835
Unrealized Gains	8	9	1
Unrealized (Losses)	(9)	(35)	(39)
Fair Value	8,957	12,201	17,797
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Fair Value	4,309	4,363	5,022
Mutual Funds, Held in Rabbi Trust \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,156	4,604	4,964
Unrealized Gains	153	6	66
Unrealized (Losses)		(247)	(8)
Fair Value	4,309	4,363	5,022
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,345	2,867	6,435
Certificates of Deposit \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	830	915	1,999
Fair Value	830	915	1,999
Certificates of Deposit \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	515	1,952	4,436
Fair Value	$ 515	$ 1,952	$ 4,436

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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+ References

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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