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Investments - Additional Information (Detail) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Feb. 01, 2014
Fair Value, Measurements, Recurring
   
Schedule of Investments [Line Items]    
Assets fair value $ 12,443us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
$ 11,424us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember