Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016	Apr. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 78,213	$ 97,854	$ 179,879
Unrealized Gains	84	116	190
Unrealized (Losses)	(23)	(309)	(95)
Fair Value	78,274	97,661	179,974
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	59,541	61,043	96,596
Unrealized Gains	32	43	60
Unrealized (Losses)	(9)	(25)	(30)
Fair Value	59,564	61,061	96,626
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,672	36,811	83,283
Unrealized Gains	52	73	130
Unrealized (Losses)	(14)	(284)	(65)
Fair Value	18,710	36,600	83,348
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	49,673	44,360	86,924
Municipal And Pre-Refunded Municipal Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,569	26,243	40,287
Unrealized Gains	27	33	42
Unrealized (Losses)	(2)		(2)
Fair Value	40,594	26,276	40,327
Municipal And Pre-Refunded Municipal Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,060	18,028	46,529
Unrealized Gains	20	58	78
Unrealized (Losses)	(1)	(2)	(10)
Fair Value	9,079	18,084	46,597
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	24,318	46,071	64,537
Corporate Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,972	33,885	43,923
Unrealized Gains	5	10	12
Unrealized (Losses)	(7)	(25)	(28)
Fair Value	18,970	33,870	43,907
Corporate Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,356	12,227	20,652
Unrealized Gains	2	9	8
Unrealized (Losses)	(10)	(35)	(30)
Fair Value	5,348	12,201	20,630
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Fair Value	3,934	4,363	4,686
Mutual Funds, Held in Rabbi Trust \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,907	4,604	4,670
Unrealized Gains	30	6	40
Unrealized (Losses)	(3)	(247)	(24)
Fair Value	3,934	4,363	4,686
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value	349	2,867	7,993
Certificates of Deposit \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		915	5,426
Unrealized Gains			1
Fair Value		915	5,427
Certificates of Deposit \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	349	1,952	2,566
Fair Value	$ 349	$ 1,952	2,566
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Fair Value			11,089
Treasury Bills \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			3,018
Unrealized Gains			2
Fair Value			3,020
Treasury Bills \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			8,067
Unrealized Gains			3
Unrealized (Losses)			(1)
Fair Value			8,069
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value			3,945
Commercial Paper \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			3,942
Unrealized Gains			3
Fair Value			3,945
Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value			800
Federal Government Agencies \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			799
Unrealized Gains			1
Fair Value			$ 800

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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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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-Section 50
-Paragraph 2
-Subparagraph (c)
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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
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