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Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sale and maturities of available-for-sale securities	$ 414,769	$ 571,236	$ 421,040
Amortization of discounts and premiums, net	7,373	8,702	6,204
Estimated fair value of available-for-sale securities	216,767	468,408
Minimum percentage rate of par value, guarantee of agencies to auction rate securities	97.00%
Number of securities with unrealized loss positions	76	128
Total, Unrealized Losses	(2,896)	(4,511)
Interest Income [Member]
Schedule of Available-for-sale Securities [Line Items]
Net realized gain (loss)	1,171	(30)	1,075
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of available-for-sale securities	20,197	29,462
Minimum percentage rate of par value, guarantee of agencies to auction rate securities	97.00%
Total, Unrealized Losses	(2,778)	(3,788)
Long-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of available-for-sale securities	126,913	351,988
Long-Term Investments [Member] | Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Par value of available-for-sale securities	22,975
Estimated fair value of available-for-sale securities	$ 20,197	$ 29,462

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