Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Jan. 31, 2015	Apr. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 179,879	$ 208,587	$ 325,082
Unrealized Gains	190	233	483
Unrealized (Losses)	(95)	(126)	(75)
Fair Value	179,974us-gaap_AvailableForSaleSecurities	208,694us-gaap_AvailableForSaleSecurities	325,490us-gaap_AvailableForSaleSecurities
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	96,596	104,201	149,724
Unrealized Gains	60	71	90
Unrealized (Losses)	(30)	(26)	(18)
Fair Value	96,626	104,246	149,796
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	83,283	104,386	175,358
Unrealized Gains	130	162	393
Unrealized (Losses)	(65)	(100)	(57)
Fair Value	83,348	104,448	175,694
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	64,537	103,326	140,411
Corporate Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	43,923	56,594	54,678
Unrealized Gains	12	20	30
Unrealized (Losses)	(28)	(24)	(17)
Fair Value	43,907	56,590	54,691
Corporate Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,652	46,754	85,583
Unrealized Gains	8	22	168
Unrealized (Losses)	(30)	(40)	(31)
Fair Value	20,630	46,736	85,720
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	86,924	73,495	113,238
Municipal And Pre-Refunded Municipal Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,287	30,509	44,522
Unrealized Gains	42	41	41
Unrealized (Losses)	(2)	(2)
Fair Value	40,327	30,548	44,563
Municipal And Pre-Refunded Municipal Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	46,529	42,840	68,511
Unrealized Gains	78	113	178
Unrealized (Losses)	(10)	(6)	(14)
Fair Value	46,597	42,947	68,675
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value	7,993	14,198	24,857
Certificates of Deposit \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,426	11,127	23,348
Unrealized Gains	1	5	10
Unrealized (Losses)			(1)
Fair Value	5,427	11,132	23,357
Certificates of Deposit \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,566	3,066	1,499
Unrealized Gains			1
Fair Value	2,566	3,066	1,500
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Fair Value	11,089	9,156	17,914
Treasury Bills \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,018	2,033	2,498
Unrealized Gains	2	3	3
Fair Value	3,020	2,036	2,501
Treasury Bills \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,067	7,111	15,404
Unrealized Gains	3	9	9
Unrealized (Losses)	(1)
Fair Value	8,069	7,120	15,413
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value	3,945	3,940	24,684
Commercial Paper \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,942	3,938	24,678
Unrealized Gains	3	2	6
Fair Value	3,945	3,940	24,684
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Fair Value	4,686	3,778	2,600
Mutual Funds, Held in Rabbi Trust \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,670	3,816	2,579
Unrealized Gains	40	16	33
Unrealized (Losses)	(24)	(54)	(12)
Fair Value	4,686	3,778	2,600
Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value	800	801	1,786
Federal Government Agencies \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	799	799	1,782
Unrealized Gains	1	2	4
Fair Value	$ 800	$ 801	$ 1,786

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Name Accounting Standards Codification

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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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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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