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Activity of Sales Return Reserve (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Revenue Recognition, Allowances [Line Items]      
Balance at beginning of year $ 14,448 $ 10,967 $ 11,367
Additions 64,313 49,412 41,034
Deductions (61,672) (45,931) (41,434)
Balance at end of year $ 17,089 $ 14,448 $ 10,967