Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 97,854	$ 208,587
Unrealized Gains	116	233
Unrealized (Losses)	(309)	(126)
Fair Value	97,661	208,694
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	61,043	104,201
Unrealized Gains	43	71
Unrealized (Losses)	(25)	(26)
Fair Value	61,061	104,246
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,811	104,386
Unrealized Gains	73	162
Unrealized (Losses)	(284)	(100)
Fair Value	36,600	104,448
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	46,071	103,326
Corporate Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,885	56,594
Unrealized Gains	10	20
Unrealized (Losses)	(25)	(24)
Fair Value	33,870	56,590
Corporate Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,227	46,754
Unrealized Gains	9	22
Unrealized (Losses)	(35)	(40)
Fair Value	12,201	46,736
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	44,360	73,495
Municipal And Pre-Refunded Municipal Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,243	30,509
Unrealized Gains	33	41
Unrealized (Losses)		(2)
Fair Value	26,276	30,548
Municipal And Pre-Refunded Municipal Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,028	42,840
Unrealized Gains	58	113
Unrealized (Losses)	(2)	(6)
Fair Value	18,084	42,947
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,867	14,198
Certificates of Deposit \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	915	11,127
Unrealized Gains		5
Fair Value	915	11,132
Certificates of Deposit \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,952	3,066
Fair Value	1,952	3,066
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Fair Value		9,156
Treasury Bills \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,033
Unrealized Gains		3
Fair Value		2,036
Treasury Bills \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		7,111
Unrealized Gains		9
Fair Value		7,120
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value		3,940
Commercial Paper \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3,938
Unrealized Gains		2
Fair Value		3,940
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Fair Value	4,363	3,778
Mutual Funds, Held in Rabbi Trust \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,604	3,816
Unrealized Gains	6	16
Unrealized (Losses)	(247)	(54)
Fair Value	$ 4,363	3,778
Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value		801
Federal Government Agencies \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		799
Unrealized Gains		2
Fair Value		$ 801

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=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
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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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