Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 208,587	$ 647,483
Unrealized Gains	233	1,002
Unrealized (Losses)	(126)	(250)
Fair Value	208,694us-gaap_AvailableForSaleSecurities	648,235us-gaap_AvailableForSaleSecurities
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	104,201	281,674
Unrealized Gains	71	184
Unrealized (Losses)	(26)	(45)
Fair Value	104,246	281,813
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	104,386	365,809
Unrealized Gains	162	818
Unrealized (Losses)	(100)	(205)
Fair Value	104,448	366,422
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	103,326	309,423
Corporate Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	56,594	100,856
Unrealized Gains	20	56
Unrealized (Losses)	(24)	(41)
Fair Value	56,590	100,871
Corporate Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	46,754	208,446
Unrealized Gains	22	268
Unrealized (Losses)	(40)	(162)
Fair Value	46,736	208,552
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	73,495	211,437
Municipal And Pre-Refunded Municipal Bonds \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,509	85,000
Unrealized Gains	41	98
Unrealized (Losses)	(2)	(2)
Fair Value	30,548	85,096
Municipal And Pre-Refunded Municipal Bonds \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,840	125,934
Unrealized Gains	113	415
Unrealized (Losses)	(6)	(8)
Fair Value	42,947	126,341
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value	14,198	39,854
Certificates of Deposit \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,127	35,844
Unrealized Gains	5	13
Unrealized (Losses)		(1)
Fair Value	11,132	35,856
Certificates of Deposit \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,066	4,000
Unrealized (Losses)		(2)
Fair Value	3,066	3,998
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Fair Value	9,156	46,455
Treasury Bills \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,033	24,873
Unrealized Gains	3	10
Fair Value	2,036	24,883
Treasury Bills \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,111	21,551
Unrealized Gains	9	21
Fair Value	7,120	21,572
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value	3,940	35,107
Commercial Paper \| Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,938	35,101
Unrealized Gains	2	7
Unrealized (Losses)		(1)
Fair Value	3,940	35,107
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Fair Value	3,778	1,666
Mutual Funds, Held in Rabbi Trust \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,816	1,591
Unrealized Gains	16	108
Unrealized (Losses)	(54)	(33)
Fair Value	3,778	1,666
Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value	801	4,293
Federal Government Agencies \| Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	799	4,287
Unrealized Gains	2	6
Fair Value	$ 801	$ 4,293

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

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-Publisher FASB

-Name Accounting Standards Codification

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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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