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Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010	Jan. 31, 2011
Proceeds from sale and maturities of available-for-sale securities			$ 157,467	$ 247,721
Amortization of discounts and premiums, net	2,007	2,092	4,329	4,329
Estimated fair value of available-for-sale securities	382,249	503,714	382,249	503,714	468,408
Minimum percentage rate of par value, guarantee of agencies to auction rate securities	97.00%		97.00%
Long-Term Investments [Member]
Estimated fair value of available-for-sale securities	322,902	157,607	322,902	157,607	351,988
Long-Term Investments [Member] | Auction Rate Securities [Member]
Par value of available-for-sale securities	26,525		26,525
Estimated fair value of available-for-sale securities	23,504	31,457	23,504	31,457	29,462
Auction Rate Securities [Member]
Estimated fair value of available-for-sale securities	23,504	31,457	23,504	31,457	29,462
Other Income [Member]
Net realized gains (losses)	$ 23	$ 80	$ 51	$ (20)

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