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Fair Value - Additional Information (Detail) (Auction Rate Securities, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013 BasisPoint	Jan. 31, 2012
Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Temporary impairment of auction rate securities	$ 595	$ 2,778
Hypothetical decline in fair value of available-for-sale securities, basis points	100
Hypothetical decline in fair value of available-for-sale securities, temporary impairment amount	$ 645

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- Definition

Hypothetical Decline in Fair Value of Available for Sale Securities Basis Points

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- Definition

Hypothetical Decline in Fair Value of Available for Sale Securities Temporary Impairment Amount

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- Definition

Temporary Impairment of Auction Rate Securities

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