Stock-based Compensation - Summary of Stock Options (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 28, 2018 USD ($) $ / shares shares
Number of Options
Beginning balance (in shares) | shares	1,192
Granted (in shares) | shares	200
Exercised (in shares) | shares	(9)
Canceled (in shares) | shares	(177)
Ending balance (in shares) | shares	1,206
Vested or expected to vest at end of year (in shares) | shares	914
Exercisable at end of year (in shares) | shares	87
Weighted- Average Exercise Price
Beginning balance (in usd per share) | $ / shares	$ 52.12
Granted (in usd per share) | $ / shares	44.09
Exercised (in usd per share) | $ / shares	36.71
Canceled (in usd per share) | $ / shares	52.90
Ending balance (in usd per share) | $ / shares	50.82
Vested or expected to vest at end of year (in usd per share) | $ / shares	49.64
Exercisable at end of year (in usd per share) | $ / shares	$ 37.38
Aggregate Intrinsic Value
Balance at end of year | $	$ 31
Vested or expected to vest at end of year | $	31
Exercisable at end of year | $	$ 31