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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	Jul. 31, 2013	Jan. 31, 2013	Jul. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 442,558	$ 378,393	$ 227,773
Unrealized Gains	355	438	434
Unrealized (Losses)	(348)	(760)	(653)
Fair Value	442,565	378,071	227,554
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	225,725	228,286	135,715
Unrealized Gains	120	242	192
Unrealized (Losses)	(46)	(42)	(17)
Fair Value	225,799	228,486	135,890
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	216,833	150,107	92,058
Unrealized Gains	235	196	242
Unrealized (Losses)	(302)	(718)	(636)
Fair Value	216,766	149,585	91,664
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	192,361	116,364	52,808
Municipal And Pre-Refunded Municipal Bonds | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	91,819	63,355	28,019
Unrealized Gains	61	85	95
Unrealized (Losses)	(9)	(17)	(7)
Fair Value	91,871	63,423	28,107
Municipal And Pre-Refunded Municipal Bonds | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	100,402	52,925	24,646
Unrealized Gains	142	76	78
Unrealized (Losses)	(54)	(60)	(23)
Fair Value	100,490	52,941	24,701
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	175,229	152,775	101,813
Corporate Bonds | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,637	88,432	53,713
Unrealized Gains	22	106	71
Unrealized (Losses)	(37)	(23)	(8)
Fair Value	79,622	88,515	53,776
Corporate Bonds | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	95,795	64,219	47,905
Unrealized Gains	51	102	150
Unrealized (Losses)	(239)	(61)	(18)
Fair Value	95,607	64,260	48,037
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value	33,694	43,235	25,198
Certificates of Deposit | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	29,870	40,870	20,671
Unrealized Gains	24	25	13
Unrealized (Losses)			(2)
Fair Value	29,894	40,895	20,682
Certificates of Deposit | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,801	2,340	4,514
Unrealized Gains	1		2
Unrealized (Losses)	(2)
Fair Value	3,800	2,340	4,516
US Treasury Bill Securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	24,344	41,105	30,295
US Treasury Bill Securities | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,115	21,354	21,425
Unrealized Gains	5	14	5
Fair Value	16,120	21,368	21,430
US Treasury Bill Securities | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,218	19,724	8,855
Unrealized Gains	6	13	10
Fair Value	8,224	19,737	8,865
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value	8,292	10,781	7,287
Commercial Paper | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,284	10,775	7,279
Unrealized Gains	8	8	8
Unrealized (Losses)		(2)
Fair Value	8,292	10,781	7,287
US Government Corporations and Agencies Securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	7,793	9,481	5,823
US Government Corporations and Agencies Securities | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3,500	4,608
Unrealized Gains		4
Fair Value		3,504	4,608
US Government Corporations and Agencies Securities | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,800	5,974	1,213
Unrealized Gains		5	2
Unrealized (Losses)	(7)	(2)
Fair Value	7,793	5,977	1,215
Mutual funds, held in rabbi trust
Schedule of Available-for-sale Securities [Line Items]
Fair Value	852
Mutual funds, held in rabbi trust | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	817
Unrealized Gains	35
Fair Value	852
Auction Rate Securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		4,330	4,330
Auction Rate Securities | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		4,925	4,925
Unrealized (Losses)		(595)	(595)
Fair Value		$ 4,330	$ 4,330

X

- Definition

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

+ References

No definition available.

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- Definition

Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

No definition available.

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- Definition

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

+ References

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)

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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=27724398&loc=d3e27232-111563



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 45

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-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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