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Marketable Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013 Securities	Jan. 31, 2012 Securities	Jan. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sale and maturities of available-for-sale securities	$ 207,576	$ 414,769	$ 571,236
Amortization of discounts and premiums, net	5,276	7,373	8,702
Number of securities with unrealized loss positions	342	76
Total, Unrealized Losses	760	2,896
Estimated fair value of available-for-sale securities	378,071	216,767
Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of available-for-sale securities	149,585	126,913
Auction Rate Securities
Schedule of Available-for-sale Securities [Line Items]
Total, Unrealized Losses	595	2,778
Estimated fair value of available-for-sale securities	4,330	20,197
Auction Rate Securities | Long Term Investments
Schedule of Available-for-sale Securities [Line Items]
Par value of available-for-sale securities	4,925
Estimated fair value of available-for-sale securities	4,330	20,197
Interest Income
Schedule of Available-for-sale Securities [Line Items]
Net realized gain (loss)	$ 248	$ 1,171	$ (30)

X

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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