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Selected Financial Statement Data - Other (Expense) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Selected Financial Statement Data [Abstract]
Foreign currency transaction (losses) gains	$ (262)	$ 29	$ (331)
Equity in losses of affiliates	(844)	(481)	(136)
Other Nonoperating Income	19		113
Other Nonoperating Expense		(85)
Other (expense) income, net	$ (1,087)	$ (537)	$ (354)

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Selected Financial Statement Data [Abstract]

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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