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Fair Value Measurements - Net Asset Value (Details) - USD ($) $ in Thousands	Apr. 28, 2018	Apr. 29, 2017
Assets
Fair Value	$ 59,354	$ 53,677
Fair Value Measured Using Net Asset Value | Available-for-sale investments
Assets
Fair Value	$ 6,700	$ 7,100

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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