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Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010	Jan. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sale and maturities of available-for-sale securities			$ 384,594	$ 396,762
Amortization of discounts and premiums, net	1,776	2,223	6,105	6,552
Estimated fair value of auction rate securities	175,795	436,280	175,795	436,280	468,408
Minimum percentage rate of par value, guarantee of agencies to auction rate securities	97.00%		97.00%
Other Income [Member]
Schedule of Available-for-sale Securities [Line Items]
Net realized gains (losses)	1,064	1	1,115	(19)
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of auction rate securities	20,956	30,143	20,956	30,143	29,462
Long-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of auction rate securities	129,146	186,202	129,146	186,202	351,988
Long-Term Investments [Member] | Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Par value of auction rate securities	23,650		23,650
Estimated fair value of auction rate securities	$ 20,956	$ 30,143	$ 20,956	$ 30,143	$ 29,462

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