Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	Apr. 25, 2015
Income from continuing operations before income taxes
United States	$ 122,196	$ 115,750	$ 96,605
Foreign	8,544	9,293	9,023
Income from continuing operations before income taxes	130,740	125,043	105,628
Federal:
- current	35,606	32,403	28,887
- deferred	2,349	3,559	406
State:
- current	5,194	4,750	4,573
- deferred	(1,703)	859	637
Foreign:
- current	2,388	2,345	2,281
-deferred	(78)	164	170
Total income tax expense	$ 43,756	$ 44,080	$ 36,954
Reconciliation of effective tax rate as it differs from the U.S. federal income tax rate
Statutory tax rate (as a percent)	35.00%	35.00%	35.00%
Increase (reduction) in income taxes resulting from:
State income taxes, net of federal benefit (as a percent)	2.70%	3.40%	3.50%
U.S. manufacturing benefit (as a percent)	(2.40%)	(2.50%)	(2.10%)
Change in valuation allowance (as a percent)	(1.00%)	(0.30%)	(0.40%)
Miscellaneous items (as a percent)	(0.80%)	(0.30%)	(1.00%)
Effective tax rate (as a percent)	33.50%	35.30%	35.00%
Undistributed earnings, reinvested	$ 27,600
Potential deferred tax attributable to undistributed foreign earnings	3,600
Assets
Deferred and other compensation	26,689	$ 25,032
State income tax - net operating losses, credits and other	4,927	5,571
Warranty	8,261	7,817
Rent	4,768	4,184
Workers' compensation	3,707	3,870
Employee benefits	3,752	3,212
Other	4,663	5,026
Valuation allowance	(1,786)	(3,625)
Total deferred tax assets	54,981	51,087
Liabilities
Property, plant and equipment	(8,453)	(7,089)
Inventory	(3,052)	(983)
Goodwill and other intangibles	(3,345)	(1,332)
Net deferred tax assets	40,131	$ 41,683
Deferred tax assets associated with loss carryforwards
Various U.S. state net operating losses (excluding federal tax effect)	5,668
Foreign net operating losses	58
Foreign capital losses	17
Future taxable income needed to fully recover net deferred tax assets	$ 100,000