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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Apr. 26, 2014 | Apr. 27, 2013 | Apr. 28, 2012
Income before income taxes [Abstract] |  |  |
United States | $ 82,705,000 | $ 63,193,000 | $ 52,631,000
Foreign | 8,854,000 | 7,492,000 | 6,319,000
Income from continuing operations before income taxes | 91,559,000 | 70,685,000 | 58,950,000
Federal: [Abstract] |  |  |
- current | 24,695,000 | 17,049,000 | 11,830,000
- deferred | 1,495,000 | 1,341,000 | (38,597,000)
State: [Abstract] |  |  |
- current | 5,345,000 | 2,746,000 | 3,446,000
- deferred | (2,082,000) | 464,000 | (1,864,000)
Foreign: [Abstract] |  |  |
- current | 1,375,000 | 739,000 | 2,040,000
- deferred | 555,000 | 1,181,000 | (1,907,000)
Total income tax expense (benefit) | 31,383,000 | 23,520,000 | (25,052,000)
Effective income tax rate reconciliation [Abstract] |  |  |
Statutory tax rate (in hundredths) | 35.00% | 35.00% | 35.00%
Increase (reduction) in income taxes resulting from [Abstract] |  |  |
State income taxes, net of federal benefit (in hundredths) | 3.10% | 3.00% | 5.00%
U.S. manufacturing benefit (in hundredths) | (1.00%) | (2.00%) | (2.30%)
Change in valuation allowance (in hundredths) | (1.20%) | (0.30%) | (78.30%)
Gain on sale of marketable securities (in hundredths) | 0.00% | (1.60%) | 0.00%
Miscellaneous items (in hundredths) | (1.60%) | (0.80%) | (1.90%)
Effective tax rate (in hundredths) | 34.30% | 33.30% | (42.50%)
Undistributed earnings, reinvested | 8,500,000 |  |
Potential deferred tax attributable to undistributed earnings | 2,100,000 |  |
Assets [Abstract] |  |  |
Deferred and other compensation | 19,774,000 | 19,510,000 |
Allowance for doubtful accounts | 5,456,000 | 9,567,000 |
State income tax - net operating losses, credits and other | 6,440,000 | 6,542,000 |
Pension | 2,097,000 | 4,632,000 |
Warranty | 6,247,000 | 5,937,000 |
Rent | 4,824,000 | 4,697,000 |
Workers' compensation | 4,068,000 | 3,804,000 |
Foreign net operating loss | 0 | 759,000 |
Other | 6,598,000 | 5,128,000 |
Valuation allowance | (4,700,000) | (6,619,000) |
Total deferred tax assets | 50,804,000 | 53,957,000 |
Liabilities [Abstract] |  |  |
Property, plant and equipment | (3,337,000) | (2,745,000) |
Net deferred tax assets | 47,467,000 | 51,212,000 |
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowances |  |  | 46,200,000
Estimated future taxable income necessary to fully recover net deferred tax assets | 122,000,000 |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | 6,619,000 |  |
Valuation allowance change | (1,919,000) |  |
Valuation allowance | 4,700,000 | 6,619,000 |
Unrecognized tax benefits [Roll Forward] |  |  |
Balance at the beginning of the period | 3,248,000 | 3,909,000 | 4,492,000
Additions [Abstract] |  |  |
Positions taken during the current year | 88,000 | 338,000 | 147,000
Positions taken during the prior year | 0 | 0 | 0
Reductions [Abstract] |  |  |
Positions taken during the current year | 0 | 0 | 0
Positions taken during the prior year | (99,000) | (28,000) | (202,000)
Decreases related to settlements with taxing authorities | 98,000 | 0 | (166,000)
Reductions resulting from the lapse of the statute of limitations | (167,000) | (971,000) | (362,000)
Balance at the end of the period | 2,972,000 | 3,248,000 | 3,909,000
Decrease in accrued interest and penalties | 100,000 |  |
Accrued interest and penalties | 300,000 | 400,000 |
Recognition of unrecognized tax benefit to decrease effective tax rate | 600,000 |  |
Cash paid for taxes | 25,000,000 | 20,500,000 | 15,200,000
U.S. State [Member] |  |  |
Assets [Abstract] |  |  |
Valuation allowance | (4,680,000) |  |
Operating Loss Carryforwards [Line Items] |  |  |
Various U.S. state net operating losses (excluding federal tax effect) | 9,215,000 |  |
Expiration | Fiscal 2015 – 2033 |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | 6,464,000 |  |
Valuation allowance change | (1,784,000) |  |
Valuation allowance | 4,680,000 |  |
Foreign [Member] |  |  |
Assets [Abstract] |  |  |
Valuation allowance | (20,000) |  |
Operating Loss Carryforwards [Line Items] |  |  |
Foreign capital losses | 20,000 |  |
Expiration | Indefinite |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | 155,000 |  |
Valuation allowance change | (135,000) |  |
Valuation allowance | $ 20,000 |  |

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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The amount of the change in the period in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
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- Definition Total 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. + 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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