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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Apr. 27, 2013 | Apr. 28, 2012 | Apr. 30, 2011
Income before income taxes [Abstract] |  |  |
United States | $ 63,218,000 | $ 60,538,000 | $ 21,331,000
Foreign | 7,492,000 | 6,319,000 | 4,635,000
Income before income taxes | 70,710,000 | 66,857,000 | 25,966,000
Components of income tax expense [Abstract] |  |  |
Federal - current | 16,873,000 | 14,392,000 | 5,935,000
Federal - deferred | 1,524,000 | (38,396,000) | 0
State - current | 2,718,000 | 3,663,000 | 930,000
State - deferred | 493,000 | (1,843,000) | 700,000
Foreign - current | 739,000 | 2,040,000 | 1,848,000
Foreign - deferred | 1,181,000 | (1,907,000) | (820,000)
Total income tax expense (benefit) | 23,528,000 | (22,051,000) | 8,593,000
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) | 3.00% | 5.00% | 4.10%
U.S. manufacturing benefit (in hundredths) | (2.00%) | (2.30%) | (1.90%)
Change in valuation allowance (in hundredths) | 0.30% | (69.10%) | 13.50%
Change in value of life insurance contracts (in hundredths) | 0.00% | 0.00% | (0.60%)
Tax benefit associated with VIE acquisition (in hundredths) | 0.00% | 0.00% | (17.60%)
Gain on sale of marketable securities | (1.60%) | 0.00% | 0.00%
Miscellaneous items (in hundredths) | 0.40% | (1.60%) | 0.60%
Effective tax rate (in hundredths) | 33.30% | (33.00%) | 33.10%
Undistributed earnings, reinvested | 7,500,000 |  |
Potential deferred tax attributable to undistributed earnings | 2,000,000 |  |
Assets [Abstract] |  |  |
Deferred and other compensation | 19,510,000 | 15,043,000 |
Allowance for doubtful accounts | 9,567,000 | 9,547,000 |
State income tax - net operating losses, credits and other | 6,542,000 | 5,911,000 |
Pension | 4,632,000 | 11,220,000 |
Warranty | 5,937,000 | 5,436,000 |
Rent | 4,697,000 | 4,590,000 |
Workers' compensation | 3,804,000 | 3,485,000 |
Foreign net operating loss | 759,000 | 914,000 |
Capital loss carryover | 0 | 3,202,000 |
Other | 5,128,000 | 4,213,000 |
Valuation allowance | (6,619,000) | (8,258,000) |
Total deferred tax assets | 53,957,000 | 55,303,000 |
Liabilities [Abstract] |  |  |
Property, plant and equipment | (2,745,000) | (2,573,000) |
Net deferred tax assets | 51,212,000 | 52,730,000 |
Operating Loss Carryforwards [Line Items] |  |  |
U.S. federal capital loss | 0 | 3,202,000 |
Foreign net operating losses | 759,000 | 914,000 |
Valuation allowances |  | 46,200,000 |
Estimated future taxable income necessary to fully recover net deferred tax assets | 136,300,000 |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | 8,258,000 |  |
Valuation allowance change | (1,639,000) |  |
Valuation allowance | 6,619,000 | 8,258,000 |
Unrecognized tax benefits [Roll Forward] |  |  |
Balance at the beginning of the period | 3,909,000 | 4,492,000 | 4,805,000
Additions [Abstract] |  |  |
Positions taken during the current year | 338,000 | 147,000 | 100,000
Positions taken during the prior year | 0 | 0 | 229,000
Reductions [Abstract] |  |  |
Positions taken during the current year | 0 | 0 | 0
Positions taken during the prior year | (28,000) | (202,000) | (359,000)
Decreases related to settlements with taxing authorities | 0 | (166,000) | (202,000)
Reductions resulting from the lapse of the statute of limitations | (971,000) | (362,000) | (81,000)
Balance at the end of the period | 3,248,000 | 3,909,000 | 4,492,000
Decrease in accrued interest and penalties | 200,000 |  |
Accrued interest and penalties | 400,000 | 600,000 |
Recognition of unrecognized tax benefit to decrease effective tax rate | 800,000 |  |
Income tax liability adjustment | 200,000 |  |
Cash paid for taxes | 20,500,000 | 15,200,000 | 9,100,000
U.S. Federal [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | 2,114,000 |  |
Valuation allowance change | (2,114,000) |  |
Valuation allowance | 0 |  |
U.S. State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Various U.S. state net operating losses (excluding federal tax effect) | 10,064,000 |  |
Expiration | Fiscal 2014 - 2033 |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | 6,121,000 |  |
Valuation allowance change | 343,000 |  |
Valuation allowance | 6,464,000 |  |
Foreign [Member] |  |  |
Assets [Abstract] |  |  |
Foreign net operating loss | 759,000 |  |
Capital loss carryover | 23,000 |  |
Operating Loss Carryforwards [Line Items] |  |  |
U.S. federal capital loss | 23,000 |  |
Foreign net operating losses | 759,000 |  |
Expiration | Fiscal 2018 - 2029 |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | 23,000 |  |
Valuation allowance change | 132,000 |  |
Valuation allowance | $ 155,000 |  |

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