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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Period | $ 54,987 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 45,947 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 34,436 us-gaap_ValuationAllowancesAndReservesBalance |
Charged to Costs and Expenses | 162,817 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 141,950 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 114,622 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |
Deductions | 164,363 us-gaap_ValuationAllowancesAndReservesDeductions | [1] | 132,910 us-gaap_ValuationAllowancesAndReservesDeductions | [1] | 103,111 us-gaap_ValuationAllowancesAndReservesDeductions | [1]
Balance at End of Period | 53,441 us-gaap_ValuationAllowancesAndReservesBalance |  | 54,987 us-gaap_ValuationAllowancesAndReservesBalance |  | 45,947 us-gaap_ValuationAllowancesAndReservesBalance |
Allowance for doubtful accounts |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Period | 642 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 1,189 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 1,483 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Charged to Costs and Expenses | 584 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 355 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 206 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Deductions | 152 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [1] | 902 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [1] | 500 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [1]
Balance at End of Period | 1,074 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 642 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 1,189 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Reserve for sales allowances |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Period | 54,345 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2] | 44,758 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2] | 32,953 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2]
Charged to Costs and Expenses | 162,233 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2] | 141,595 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2] | 114,416 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2]
Deductions | 164,211 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [1],[2] | 132,008 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [1],[2] | 102,611 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [1],[2]
Balance at End of Period | $ 52,367 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2] | $ 54,345 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2] | $ 44,758 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [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.

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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