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Accounting Policies - Other Various Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Cost of Sales
Improvement in gross margin due to legal settlement (as a percent)		0.20%	0.30%
Research and Development Costs
Expenditures for research and development costs	$ 7.9	$ 8.0	$ 6.3
Advertising Expenses
Gross advertising expenses	$ 88.3	$ 82.1	$ 70.8
Percentage reimbursement on shared advertising program	30.00%
Insurance/Self-Insurance
Maximum deductibles for excess loss coverages	$ 1.5

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Insurance and Self Insurance Abstract

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Typical maximum deductible on various excess loss coverages, including auto, product, employee-related health care and workers' compensation liabilities.

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Represents the percentage improvement in gross margin resulting from a legal settlement.

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The percentage of the cost of a shared advertising program for which the entity is reimbursed.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
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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.

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-Section 50
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