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Shareholders' Equity - Stock Repurchases (Details)	12 Months Ended
	Apr. 29, 2017 USD ($) shares	Apr. 27, 2019 USD ($) shares
Equity [Abstract]
Stock repurchase program, authorized amount		$ 100,000,000
Purchase of common stock (in shares) | shares	280,168
Purchase of common stock	$ 9,800,000
Stock repurchased and retired during program (in shares) | shares		2,277,466
Stock repurchased and retired during program		$ 71,900,000

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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