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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jan. 31, 2014	Oct. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 229,342	$ 647,483	$ 530,169
Unrealized Gains	387	1,002	765
Unrealized (Losses)	(124)	(250)	(187)
Fair Value	229,605	648,235	530,747
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	114,946	281,674	227,439
Unrealized Gains	89	184	138
Unrealized (Losses)	(30)	(45)	(30)
Fair Value	115,005	281,813	227,547
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	114,396	365,809	302,730
Unrealized Gains	298	818	627
Unrealized (Losses)	(94)	(205)	(157)
Fair Value	114,600	366,422	303,200
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	130,362	309,423	234,041
Corporate Bonds | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	70,859	100,856	77,806
Unrealized Gains	47	56	37
Unrealized (Losses)	(30)	(41)	(25)
Fair Value	70,876	100,871	77,818
Corporate Bonds | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	59,504	208,446	156,170
Unrealized Gains	65	268	197
Unrealized (Losses)	(83)	(162)	(144)
Fair Value	59,486	208,552	156,223
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	65,155	211,437	207,397
Municipal And Pre-Refunded Municipal Bonds | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,746	85,000	84,662
Unrealized Gains	34	98	71
Unrealized (Losses)		(2)	(3)
Fair Value	26,780	85,096	84,730
Municipal And Pre-Refunded Municipal Bonds | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,292	125,934	122,356
Unrealized Gains	90	415	324
Unrealized (Losses)	(7)	(8)	(13)
Fair Value	38,375	126,341	122,667
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value	15,668	39,854	28,752
Certificates of Deposit | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,978	35,844	26,733
Unrealized Gains	4	13	17
Unrealized (Losses)		(1)
Fair Value	11,982	35,856	26,750
Certificates of Deposit | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,686	4,000	2,001
Unrealized Gains			1
Unrealized (Losses)		(2)
Fair Value	3,686	3,998	2,002
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Fair Value	8,726	46,455	22,274
Treasury Bills | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		24,873	10,079
Unrealized Gains		10	3
Fair Value		24,883	10,082
Treasury Bills | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,717	21,551	12,183
Unrealized Gains	9	21	9
Fair Value	8,726	21,572	12,192
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value	3,593	35,107	28,167
Commercial Paper | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,592	35,101	28,159
Unrealized Gains	1	7	10
Unrealized (Losses)		(1)	(2)
Fair Value	3,593	35,107	28,167
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Fair Value	3,529	1,666	1,328
Mutual Funds, Held in Rabbi Trust | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,399	1,591	1,236
Unrealized Gains	134	108	92
Unrealized (Losses)	(4)	(33)
Fair Value	3,529	1,666	1,328
Federal Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,572	4,293	8,788
Federal Government Agencies | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,771
Unrealized Gains	3
Fair Value	1,774
Federal Government Agencies | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	798	4,287	8,784
Unrealized Gains		6	4
Fair Value	$ 798	$ 4,293	$ 8,788

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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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- Definition

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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-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.

+ References

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-Publisher FASB

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