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Material Customers - Narrative (Details) $ in Millions	12 Months Ended
	Apr. 30, 2016 USD ($) customer	May 02, 2015 USD ($) customer	May 03, 2014 customer
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 | customer	2	2	2
Accounts receivable	$ 90.0	$ 83.6
Automotive | Maltese subsidiary
Revenue, Major Customer [Line Items]
Accounts receivable	$ 51.4	$ 55.1
Automotive | Customer 1
Revenue, Major Customer [Line Items]
Percentage of consolidated net sales	49.50%	44.80%	36.40%
Automotive | Customer 2
Revenue, Major Customer [Line Items]
Percentage of consolidated net sales	11.50%	12.80%	14.50%

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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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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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