Note 1 - Significant Accounting Policies (Details Textual) - USD ($) $ in Millions	12 Months Ended
	May. 02, 2015	May. 03, 2014	Apr. 27, 2013
Other Noncurrent Liabilities [Member]
Self Insurance Reserve and Coverage by Insurance, Noncurrent	$ 5.9	$ 6.1
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	7 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	30 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	15 years
Shipping, Handling and Transportation Costs	$ 44.4	$ 44.4	$ 44.2
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements	206,000	188,000	172,000
Self Insurance Reserve, Noncurrent, Covered by Insurance	$ 4.7	$ 5.1
Inventory, Finished Goods, Gross	24.9	27.2
Inventory, Raw Materials, Gross	18.0	16.7
Marketing Expense	$ 42.4	$ 50.2	$ 44.6