Share-Based Compensation Plans Restricted Stock Units and Awards Activity (Details)	12 Months Ended
	Apr. 29, 2016 $ / 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	155,949
Granted (in shares) | shares	12,078
Vested (in shares) | shares	(66,573)
Forfeited (in shares) | shares	(11,799)
Nonvested, ending balance (in shares) | shares	89,655
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	$ 41.39
Granted (in dollars per share) | $ / shares	46.63
Vested (in dollars per share) | $ / shares	43.95
Forfeited (in dollars per share) | $ / shares	35.76
Non-vested, ending (in dollars per share) | $ / shares	$ 40.93
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	88,867
Granted (in shares) | shares	119,291
Vested (in shares) | shares	(57,059)
Forfeited (in shares) | shares	(5,981)
Nonvested, ending balance (in shares) | shares	145,118
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	$ 45.40
Granted (in dollars per share) | $ / shares	46.34
Vested (in dollars per share) | $ / shares	46.89
Forfeited (in dollars per share) | $ / shares	47.38
Non-vested, ending (in dollars per share) | $ / shares	$ 45.51