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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Oct. 31, 2015
Nov. 01, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Transfers out of Level 1 into Level 2 $ 0 $ 0 $ 0 $ 0
Transfers out of Level 2 into Level 1 0 0 0 0
Impairment charge on long-lived assets 0 0 0 0
Level 3 [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair value measurement, purchases, sales, issuances, or settlements $ 0 $ 0 $ 0 $ 0