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Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Apr. 25, 2015 | Apr. 26, 2014 | Apr. 27, 2013
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Notes receivable, gross | $ 1.9 us-gaap_NotesReceivableGross | $ 4.3 us-gaap_NotesReceivableGross |
Cost of Sales |  |  |
Improvement in gross margin due to legal settlement (as a percent) | 0.40%lzb_PercentageOfGrossMarginImprovedDueToLegalSettlement |  |
Research and Development Costs |  |  |
Expenditures for research and development costs from continuing operations | 8.0 us-gaap_ResearchAndDevelopmentExpense | 7.9 us-gaap_ResearchAndDevelopmentExpense | 7.2 us-gaap_ResearchAndDevelopmentExpense
Advertising Expenses |  |  |
Gross advertising expenses | 63.3 us-gaap_AdvertisingExpense | 59.6 us-gaap_AdvertisingExpense | 53.9 us-gaap_AdvertisingExpense
Percentage reimbursement on shared advertising program | 34.00%lzb_PercentageReimbursementOnAdvertising |  |
Insurance/Self-Insurance |  |  |
Maximum deductibles for excess loss coverages | 1.5 lzb_MaximumDeductiblesForInsuranceArrangement |  |
Allowance for notes receivable |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Allowance for credit losses | $ 0 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember | $ 0.2 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForNotesReceivableMember |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 3 -Article 9 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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