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Schedule II-Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 34,436 $ 32,174 $ 29,092
Charged to Costs and Expenses 115,241 78,407 60,700
Deductions 103,111 [1] 76,145 [1] 57,618 [1]
Balance at End of Period 46,566 34,436 32,174
Allowance for doubtful accounts
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 1,483 1,350 1,589
Charged to Costs and Expenses 825 643 371
Deductions 500 [1] 510 [1] 610 [1]
Balance at End of Period 1,808 1,483 1,350
Allowance for sales returns
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 32,953 [2] 30,824 [2] 27,503 [2]
Charged to Costs and Expenses 114,416 [2] 77,764 [2] 60,329 [2]
Deductions 102,611 [1],[2] 75,635 [1],[2] 57,008 [1],[2]
Balance at End of Period $ 44,758 [2] $ 32,953 [2] $ 30,824 [2]
[1] Accounts written off as uncollectible, net of recoveries.
[2] See Note A in the accompanying Notes to Consolidated Financial Statements for a description of sales allowances.