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Income Taxes (Details) (USD $) | 12 Months Ended
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Apr. 25, 2015 | Apr. 26, 2014 | Apr. 27, 2013
Income before income taxes for continuing operations |  |  |
United States | $ 96,605,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 82,705,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 63,193,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign | 9,023,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 8,854,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 7,492,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income from continuing operations before income taxes | 105,628,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 91,559,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 70,685,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Federal: |  |  |
- current | 28,887,000 us-gaap_CurrentFederalTaxExpenseBenefit | 24,695,000 us-gaap_CurrentFederalTaxExpenseBenefit | 17,049,000 us-gaap_CurrentFederalTaxExpenseBenefit
- deferred | 406,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 1,495,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 1,341,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State: |  |  |
- current | 4,573,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 5,345,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 2,746,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
- deferred | 637,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (2,082,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 464,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign: |  |  |
- current | 2,281,000 us-gaap_CurrentForeignTaxExpenseBenefit | 1,375,000 us-gaap_CurrentForeignTaxExpenseBenefit | 739,000 us-gaap_CurrentForeignTaxExpenseBenefit
-deferred | 170,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 555,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 1,181,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total income tax expense (benefit) | 36,954,000 us-gaap_IncomeTaxExpenseBenefit | 31,383,000 us-gaap_IncomeTaxExpenseBenefit | 23,520,000 us-gaap_IncomeTaxExpenseBenefit
Reconciliation of effective tax rate as it differs from the U.S. federal income tax rate |  |  |
Statutory tax rate (as a percent) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase (reduction) in income taxes resulting from: |  |  |
State income taxes, net of federal benefit (as a percent) | 3.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
U.S. manufacturing benefit (as a percent) | (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities | (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Change in valuation allowance (as a percent) | (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Gain on sale of marketable securities (as a percent) |  |  | (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfAssets
Miscellaneous items (as a percent) | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate (as a percent) | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 34.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 33.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Undistributed earnings, reinvested | 24,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Potential deferred tax attributable to undistributed foreign earnings | 3,100,000 us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries |  |
Assets |  |  |
Deferred and other compensation | 22,085,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation | 19,774,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation |
Allowance for doubtful accounts | 2,255,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | 5,456,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts |
State income tax - net operating losses, credits and other | 6,032,000 lzb_DeferredTaxAssetOperatingLossCarryForwardsCreditsAndOtherStateAndLocal | 6,440,000 lzb_DeferredTaxAssetOperatingLossCarryForwardsCreditsAndOtherStateAndLocal |
Pension | 2,828,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions | 2,097,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions |
Warranty | 6,466,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves | 6,247,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves |
Rent | 5,174,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent | 4,824,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent |
Workers' compensation | 4,173,000 lzb_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsWorkersCompensation | 4,068,000 lzb_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsWorkersCompensation |
Employee benefits | 3,096,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits | 2,838,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits |
Other | 1,262,000 us-gaap_DeferredTaxAssetsOther | 3,760,000 us-gaap_DeferredTaxAssetsOther |
Valuation allowance | (4,322,000)us-gaap_DeferredTaxAssetsValuationAllowance | (4,700,000)us-gaap_DeferredTaxAssetsValuationAllowance |
Total deferred tax assets | 49,049,000 us-gaap_DeferredTaxAssetsNet | 50,804,000 us-gaap_DeferredTaxAssetsNet |
Liabilities |  |  |
Property, plant and equipment | (2,722,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (3,337,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Net deferred tax assets | 46,327,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | 47,467,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Deferred tax assets associated with loss carryforwards |  |  |
Various U.S state net operating losses (excluding federal tax effect) | 8,678,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |  |
Foreign capital losses | 20,000 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards |  |
Future taxable income needed to fully recover net deferred tax assets | $ 118,000,000 lzb_EstimatedFutureTaxableIncome |  |

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