Share-Based Compensation Plans Restricted Stock Units and Awards Activity (Details)	12 Months Ended
	Apr. 28, 2017 $ / shares shares
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning balance (in shares) | shares	89,655
Granted (in shares) | shares	0
Vested (in shares) | shares	(85,222)
Forfeited (in shares) | shares	(4,433)
Nonvested, ending balance (in shares) | shares	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested, beginning (in dollars per share) | $ / shares	$ 40.93
Granted (in dollars per share) | $ / shares	0.00
Vested (in dollars per share) | $ / shares	41.25
Forfeited (in dollars per share) | $ / shares	34.74
Non-vested, ending (in dollars per share) | $ / shares	$ 0.00
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning balance (in shares) | shares	145,118
Granted (in shares) | shares	97,862
Vested (in shares) | shares	(211,743)
Forfeited (in shares) | shares	(7,418)
Nonvested, ending balance (in shares) | shares	23,819
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested, beginning (in dollars per share) | $ / shares	$ 45.51
Granted (in dollars per share) | $ / shares	39.25
Vested (in dollars per share) | $ / shares	43.55
Forfeited (in dollars per share) | $ / shares	43.33
Non-vested, ending (in dollars per share) | $ / shares	$ 37.91