Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 155,330	$ 97,854
Unrealized Gains	170	116
Unrealized (Losses)	(145)	(309)
Fair Value	155,355	97,661
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	111,134	61,043
Unrealized Gains	35	43
Unrealized (Losses)	(102)	(25)
Fair Value	111,067	61,061
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	44,196	36,811
Unrealized Gains	135	73
Unrealized (Losses)	(43)	(284)
Fair Value	44,288	36,600
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	71,261	44,360
Municipal And Pre-Refunded Municipal Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	51,731	26,243
Unrealized Gains	28	33
Unrealized (Losses)	(12)
Fair Value	51,747	26,276
Municipal And Pre-Refunded Municipal Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,488	18,028
Unrealized Gains	35	58
Unrealized (Losses)	(9)	(2)
Fair Value	19,514	18,084
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	78,398	46,071
Corporate Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	59,403	33,885
Unrealized Gains	7	10
Unrealized (Losses)	(90)	(25)
Fair Value	59,320	33,870
Corporate Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,102	12,227
Unrealized Gains	9	9
Unrealized (Losses)	(33)	(35)
Fair Value	19,078	12,201
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Fair Value	4,673	4,363
Mutual Funds, Held in Rabbi Trust \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,583	4,604
Unrealized Gains	91	6
Unrealized (Losses)	(1)	(247)
Fair Value	4,673	4,363
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,023	2,867
Certificates of Deposit \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		915
Fair Value		915
Certificates of Deposit \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,023	1,952
Fair Value	$ 1,023	$ 1,952

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
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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
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-SubTopic 10
-Section S99
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