2.2.0.25truefalse06021 - Disclosure - Summary of Significant Accounting Policies (Details 1)truefalseIn Millionsfalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000884629duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009 USD ($) USD ($) / shares $TwelveMonthsEnded_31Dec2009http://www.sec.gov/CIK0000884629duration2009-01-01T00:00:002009-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDfalsefalse1/1/2008 - 12/31/2008 USD ($) USD ($) / shares $TwelveMonthsEnded_31Dec2008http://www.sec.gov/CIK0000884629duration2008-01-01T00:00:002008-12-31T00:00:00SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0wpi_ProvisionForSalesReturnsAndAllowancesAbstractwpifalsenadurationProvision for Sales Returns and Allowances.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvision for Sales Returns and Allowances.falsefalseProvision for Sales Returns and Allowances3false0us-gaap_ValuationAllowancesAndReservesBalanceus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse418600000418.6falsetruefalsefalsefalse2truefalsefalse328200000328.2falsetruefalsefalsefalse3truefalsefalse387700000387.7falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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 costsReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseBalance at Beginning of Period4false0us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpenseus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse22275000002227.5falsefalsefalsefalsefalse2truefalsefalse18407000001840.7falsefalsefalsefalsefalse3truefalsefalse17801000001780.1falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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, charged to costs and expenses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseProvision related to sales5false0us-gaap_ValuationAllowancesAndReservesDeductionsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegatedtotal1truefalsefalse-2219100000-2219.1falsefalsefalsefalsefalse2truefalsefalse-1805400000-1805.4falsefalsefalsefalsefalse3truefalsefalse-1839600000-1839.6falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal of the deductions in a given period to 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, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 truefalseCredits and payments6false0us-gaap_ValuationAllowancesAndReservesReservesOfBusinessesAcquiredus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse5510000055.1falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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, acquired in a business combinationReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseAdd: Arrow Acquisition7false0us-gaap_ValuationAllowancesAndReservesBalanceus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse427000000427.0falsefalsefalsefalsefalse2truefalsefalse418600000418.6falsefalsefalsefalsefalse3truefalsefalse328200000328.2falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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 costsReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseBalance at End of Period8false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://watson.com/role/summaryofsignificantaccountingpoliciesdetails21falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Chargebacks [Member] 1/1/2010 - 12/31/2010 USD ($) $TwelveMonthsEnded_31Dec2010_Chargebacks_Memberhttp://www.sec.gov/CIK0000884629duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseChargebacks [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldiwpi_ChargebacksMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Chargebacks [Member] 1/1/2009 - 12/31/2009 USD ($) $TwelveMonthsEnded_31Dec2009_Chargebacks_Memberhttp://www.sec.gov/CIK0000884629duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseChargebacks [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldiwpi_ChargebacksMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Chargebacks [Member] 1/1/2008 - 12/31/2008 USD ($) $TwelveMonthsEnded_31Dec2008_Chargebacks_Memberhttp://www.sec.gov/CIK0000884629duration2008-01-01T00:00:002008-12-31T00:00:00falsefalseChargebacks [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldiwpi_ChargebacksMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseChargebacks [Member]9true0wpi_ProvisionForSalesReturnsAndAllowancesAbstractwpifalsenadurationProvision for Sales Returns and Allowances.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvision for Sales Returns and Allowances.falsefalseProvision for Sales Returns and Allowances10false0us-gaap_ValuationAllowancesAndReservesBalanceus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse117400000117.4falsefalsefalsefalsefalse2truefalsefalse120600000120.6falsefalsefalsefalsefalse3truefalsefalse164400000164.4falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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 costsReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseBalance at Beginning of Period11false0us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpenseus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse11755000001175.5falsefalsefalsefalsefalse2truefalsefalse11690000001169.0falsefalsefalsefalsefalse3truefalsefalse12240000001224.0falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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, charged to costs and expenses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseProvision related to sales12false0us-gaap_ValuationAllowancesAndReservesDeductionsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegatedtotal1truefalsefalse-1192100000-1192.1falsefalsefalsefalsefalse2truefalsefalse-1177500000-1177.5falsefalsefalsefalsefalse3truefalsefalse-1267800000-1267.8falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal of the deductions in a given period to 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, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 truefalseCredits and payments13false0us-gaap_ValuationAllowancesAndReservesReservesOfBusinessesAcquiredus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse53000005.3falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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, acquired in a business combinationReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseAdd: Arrow Acquisition14false0us-gaap_ValuationAllowancesAndReservesBalanceus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse100800000100.8falsefalsefalsefalsefalse2truefalsefalse117400000117.4falsefalsefalsefalsefalse3truefalsefalse120600000120.6falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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 costsReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseBalance at End of Period15false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://watson.com/role/summaryofsignificantaccountingpoliciesdetails21falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse7falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Rebates [Member] 1/1/2010 - 12/31/2010 USD ($) $TwelveMonthsEnded_31Dec2010_Rebates_Memberhttp://www.sec.gov/CIK0000884629duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseRebates [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldiwpi_RebatesMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Rebates [Member] 1/1/2009 - 12/31/2009 USD ($) $TwelveMonthsEnded_31Dec2009_Rebates_Memberhttp://www.sec.gov/CIK0000884629duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseRebates [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldiwpi_RebatesMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$9falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Rebates [Member] 1/1/2008 - 12/31/2008 USD ($) $TwelveMonthsEnded_31Dec2008_Rebates_Memberhttp://www.sec.gov/CIK0000884629duration2008-01-01T00:00:002008-12-31T00:00:00falsefalseRebates [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldiwpi_RebatesMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseRebates [Member]16true0wpi_ProvisionForSalesReturnsAndAllowancesAbstractwpifalsenadurationProvision for Sales Returns and Allowances.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvision for Sales Returns and Allowances.falsefalseProvision for Sales Returns and Allowances17false0us-gaap_ValuationAllowancesAndReservesBalanceus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse188400000188.4falsefalsefalsefalsefalse2truefalsefalse125800000125.8falsefalsefalsefalsefalse3truefalsefalse154300000154.3falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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 costsReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseBalance at Beginning of Period18false0us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpenseus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse755000000755.0falsefalsefalsefalsefalse2truefalsefalse415100000415.1falsefalsefalsefalsefalse3truefalsefalse309100000309.1falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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, charged to costs and expenses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseProvision related to sales19false0us-gaap_ValuationAllowancesAndReservesDeductionsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegatedtotal1truefalsefalse-723500000-723.5falsefalsefalsefalsefalse2truefalsefalse-389500000-389.5falsefalsefalsefalsefalse3truefalsefalse-337600000-337.6falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal of the deductions in a given period to 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, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 truefalseCredits and payments20false0us-gaap_ValuationAllowancesAndReservesReservesOfBusinessesAcquiredus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse3700000037.0falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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, acquired in a business combinationReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseAdd: Arrow Acquisition21false0us-gaap_ValuationAllowancesAndReservesBalanceus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse219900000219.9falsefalsefalsefalsefalse2truefalsefalse188400000188.4falsefalsefalsefalsefalse3truefalsefalse125800000125.8falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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 costsReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseBalance at End of Period22false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://watson.com/role/summaryofsignificantaccountingpoliciesdetails21falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse10falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Returns and Other Allowances [Member] 1/1/2010 - 12/31/2010 USD ($) $TwelveMonthsEnded_31Dec2010_Returns_And_Other_Allowances_Memberhttp://www.sec.gov/CIK0000884629duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseReturns and Other Allowances [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldiwpi_ReturnsAndOtherAllowancesMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$11falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Returns and Other Allowances [Member] 1/1/2009 - 12/31/2009 USD ($) $TwelveMonthsEnded_31Dec2009_Returns_And_Other_Allowances_Memberhttp://www.sec.gov/CIK0000884629duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseReturns and Other Allowances [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldiwpi_ReturnsAndOtherAllowancesMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$12falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Returns and Other Allowances [Member] 1/1/2008 - 12/31/2008 USD ($) $TwelveMonthsEnded_31Dec2008_Returns_And_Other_Allowances_Memberhttp://www.sec.gov/CIK0000884629duration2008-01-01T00:00:002008-12-31T00:00:00falsefalseReturns and Other Allowances [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldiwpi_ReturnsAndOtherAllowancesMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseReturns and Other Allowances [Member]23true0wpi_ProvisionForSalesReturnsAndAllowancesAbstractwpifalsenadurationProvision for Sales Returns and Allowances.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvision for Sales Returns and Allowances.falsefalseProvision for Sales Returns and Allowances24false0us-gaap_ValuationAllowancesAndReservesBalanceus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse9750000097.5falsefalsefalsefalsefalse2truefalsefalse6950000069.5falsefalsefalsefalsefalse3truefalsefalse5610000056.1falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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 costsReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseBalance at Beginning of Period25false0us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpenseus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse206500000206.5falsefalsefalsefalsefalse2truefalsefalse183800000183.8falsefalsefalsefalsefalse3truefalsefalse179800000179.8falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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, charged to costs and expenses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseProvision related to sales26false0us-gaap_ValuationAllowancesAndReservesDeductionsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegatedtotal1truefalsefalse-214700000-214.7falsefalsefalsefalsefalse2truefalsefalse-167100000-167.1falsefalsefalsefalsefalse3truefalsefalse-166400000-166.4falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal of the deductions in a given period to 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, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 truefalseCredits and payments27false0us-gaap_ValuationAllowancesAndReservesReservesOfBusinessesAcquiredus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse1130000011.3falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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, acquired in a business combinationReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseAdd: Arrow Acquisition28false0us-gaap_ValuationAllowancesAndReservesBalanceus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse8930000089.3falsefalsefalsefalsefalse2truefalsefalse9750000097.5falsefalsefalsefalsefalse3truefalsefalse6950000069.5falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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 costsReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseBalance at End of Period29false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://watson.com/role/summaryofsignificantaccountingpoliciesdetails21falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse13falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Cash Discounts [Member] 1/1/2010 - 12/31/2010 USD ($) $TwelveMonthsEnded_31Dec2010_Reserve_For_Cash_Discount_Memberhttp://www.sec.gov/CIK0000884629duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseCash Discounts [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ReserveForCashDiscountMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$14falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Cash Discounts [Member] 1/1/2009 - 12/31/2009 USD ($) $TwelveMonthsEnded_31Dec2009_Reserve_For_Cash_Discount_Memberhttp://www.sec.gov/CIK0000884629duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseCash Discounts [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ReserveForCashDiscountMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$15falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : Cash Discounts [Member] 1/1/2008 - 12/31/2008 USD ($) $TwelveMonthsEnded_31Dec2008_Reserve_For_Cash_Discount_Memberhttp://www.sec.gov/CIK0000884629duration2008-01-01T00:00:002008-12-31T00:00:00falsefalseCash Discounts [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ReserveForCashDiscountMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseCash Discounts [Member]30true0wpi_ProvisionForSalesReturnsAndAllowancesAbstractwpifalsenadurationProvision for Sales Returns and Allowances.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvision for Sales Returns and Allowances.falsefalseProvision for Sales Returns and Allowances31false0us-gaap_ValuationAllowancesAndReservesBalanceus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse1530000015.3falsefalsefalsefalsefalse2truefalsefalse1230000012.3falsefalsefalsefalsefalse3truefalsefalse1290000012.9falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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 costsReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseBalance at Beginning of Period32false0us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpenseus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse9050000090.5falsefalsefalsefalsefalse2truefalsefalse7280000072.8falsefalsefalsefalsefalse3truefalsefalse6720000067.2falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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, charged to costs and expenses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseProvision related to sales33false0us-gaap_ValuationAllowancesAndReservesDeductionsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegatedtotal1truefalsefalse-88800000-88.8falsefalsefalsefalsefalse2truefalsefalse-71300000-71.3falsefalsefalsefalsefalse3truefalsefalse-67800000-67.8falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal of the deductions in a given period to 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, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 truefalseCredits and payments34false0us-gaap_ValuationAllowancesAndReservesReservesOfBusinessesAcquiredus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse15000001.5falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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, acquired in a business combinationReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseAdd: Arrow Acquisition35false0us-gaap_ValuationAllowancesAndReservesBalanceus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse1700000017.0falsetruefalsefalsefalse2truefalsefalse1530000015.3falsetruefalsefalsefalse3truefalsefalse1230000012.3falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal 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 costsReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 falsefalseBalance at End of Period334Summary of Significant Accounting Policies (Details 1) (USD $)HundredThousandsUnKnownUnKnownUnKnownfalsetrue