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Material Customers - Narrative (Details) $ in Millions	12 Months Ended
	Apr. 28, 2018 USD ($)	Apr. 29, 2017 USD ($)	Apr. 30, 2016
Minimum
Revenue, Major Customer [Line Items]
Accounts receivable - collection terms	30 days
Maximum
Revenue, Major Customer [Line Items]
Accounts receivable - collection terms	60 days
Automotive
Revenue, Major Customer [Line Items]
Number of significant customers	2
Automotive | Customer 1
Revenue, Major Customer [Line Items]
Percentage of consolidated net sales	43.30%	49.60%	49.50%
Automotive | Customer 2
Revenue, Major Customer [Line Items]
Percentage of consolidated net sales	12.30%	9.30%	11.50%
Automotive | Material Customers [Member]
Revenue, Major Customer [Line Items]
Accounts receivable	$ 83.8	$ 90.6
North American Automotive [Member] | Automotive | Material Customers [Member]
Revenue, Major Customer [Line Items]
Accounts receivable	$ 53.4	$ 55.3

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- Definition

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Number of Significant Customers

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- Definition

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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