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Securities Available for Sale - Additional Information (Detail) (USD $)	9 Months Ended
	Nov. 01, 2014
Schedule of Available-for-sale Securities [Line Items]
Impairment charges on available for sale security	$ 0
Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Anticipated maturity period	1 month
Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Anticipated maturity period	43 months

X

- Definition

Available For Sale Securities Expected Maturity Period

+ References

No definition available.

+ Details

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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