Stock-based Compensation (Tables)

12 Months Ended

Apr. 29, 2017

Summary of Weighted-Average Assumptions

The fair value of stock options granted was estimated as of the grant date using a Black-Scholes option-pricing model with the following assumptions:

	Fiscal Year Ended
	April 29, 2017			April 30, 2016			April 25, 2015
Expected dividend yield	2.0		%	1.8		%	2.0		%
Expected stock price volatility	21.2		%	25.6		%	26.3		%
Risk-free interest rate	1.2		%	2.1		%	2.1		%
Expected life (years)	6.6			6.7			7.0
Weighted average grant date fair value per share	$	8.32		$	9.66		$	9.78

Summary of Stock Options

The following is a summary of stock option activity:

	Number of Options		Weighted- Average Exercise Price		Aggregate Intrinsic Value
Balance as of April 30, 2016	1,110		$	52.09
Granted	189		48.46
Exercised	(27	)	35.75
Canceled	(80	)	48.47
Balance as of April 29, 2017	1,192		$	52.12	$	1,155
Vested or expected to vest as of April 29, 2017	1,145		$	52.14	$	1,091
Exercisable as of April 29, 2017	44		$	36.78	$	350

Summary of Non-Vested Restricted Stock Awards and Performance Unit Awards

The following is a summary of restricted stock award activity:

	Restricted Stock Awards
	Shares		Weighted- Average Grant  Date Fair Value
Outstanding at April 30, 2016	760		$	38.18
Granted	18		45.78
Vested	(170	)	39.10
Forfeitures	(129	)	37.15
Outstanding at April 29, 2017	479		$	38.41

The following is a summary of restricted stock unit activity:

	Restricted Stock Units
	Shares		Weighted- Average Grant  Date Fair Value
Outstanding at April 30, 2016	71		44.26
Granted	265		48.19
Vested	(16	)	43.60
Forfeitures	(16	)	48.41
Outstanding at April 29, 2017	304		$	47.50

The following is a summary of performance unit award activity at target:

	Performance Unit Awards
	Shares		Weighted- Average Grant Date Fair Value
Outstanding at April 30, 2016	157		$	47.56
Granted	86		56.60
Vested	—		—
Forfeitures and cancellations	(13	)	48.37
Outstanding at April 29, 2017	230		$	50.88

Employee Stock Purchase Plan [Member]

Summary of Weighted-Average Assumptions

We estimate the grant date fair value of shares purchased under our ESPP using the Black-Scholes option pricing valuation model with the following weighted average assumptions:

	Fiscal Year Ended
	April 29, 2017			April 30, 2016			April 25, 2015
Expected dividend yield	2.3		%	2.0		%	1.6		%
Expected stock price volatility	32.9		%	21.1		%	31.0		%
Risk-free interest rate	0.7		%	0.5		%	0.1		%
Expected life (years)	0.6			0.6			0.5
Weighted average grant date fair value per share	$	10.33		$	9.16		$	10.74

Capital Accumulation Plan (CAP) [Member]

Summary of Weighted-Average Assumptions

We estimate the grant date fair value of shares purchased under our CAP using the Black-Scholes option pricing valuation model with the following weighted average assumptions:

	Fiscal Year Ended
	April 29, 2017			April 30, 2016			April 25, 2015
Expected dividend yield	2.3		%	2.0		%	1.6		%
Expected stock price volatility	28.3		%	19.7		%	31.0		%
Risk-free interest rate	0.9		%	0.6		%	0.3		%
Expected life (years)	1.0			1.0			1.0
Weighted average grant date fair value per share	$	15.21		$	14.13		$	17.67